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rationalization MCQ Questions for Class 10

rationalization se related questions ko ek jagah revise karein. Har question me bilingual content, answer feedback aur explanation available hai.

Practice Questions

20 questions tagged with rationalization.

Question 1/20 Expert Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 15

कौन सा विकल्प \(\frac{2}{\sqrt{5}+1}\) को परिमेय हर वाले रूप में सही लिखता है?

Which option correctly writes \(\frac{2}{\sqrt{5}+1}\) with a rational denominator?

Explanation opens after your attempt
Correct Answer

A. \(\frac{\sqrt{5}-1}{2}\)

Step 1

Concept

Multiply by the conjugate \(\sqrt{5}-1\).

Step 2

Why this answer is correct

(\frac{2\(\sqrt{5}-1\)}{5-1}=\frac{\sqrt{5}-1}{2}).

Step 3

Exam Tip

Multiplying by the conjugate makes the denominator rational. चरण 1: हर को \(\sqrt{5}-1\) से गुणा करें। चरण 2: (\frac{2\(\sqrt{5}-1\)}{5-1}=\frac{\sqrt{5}-1}{2})। चरण 3: संयुग्मी से गुणा करने पर हर परिमेय बन जाता है।

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Question 2/20 Expert Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 15

कौन सा विकल्प \(\sqrt{2}+\frac{1}{\sqrt{2}}\) का सही रूप और प्रकार देता है?

Which option gives the correct form and type of \(\sqrt{2}+\frac{1}{\sqrt{2}}\)?

Explanation opens after your attempt
Correct Answer

A. \(\frac{3\sqrt{2}}{2}\) और अपरिमेय\(\frac{3\sqrt{2}}{2}\) and irrational

Step 1

Concept

\(\frac{1}{\sqrt{2}}=\frac{\sqrt{2}}{2}\).

Step 2

Why this answer is correct

\(\sqrt{2}+\frac{\sqrt{2}}{2}=\frac{3\sqrt{2}}{2}\) which is irrational.

Step 3

Exam Tip

Rationalize the denominator before combining terms. चरण 1: \(\frac{1}{\sqrt{2}}=\frac{\sqrt{2}}{2}\)। चरण 2: \(\sqrt{2}+\frac{\sqrt{2}}{2}=\frac{3\sqrt{2}}{2}\) जो अपरिमेय है। चरण 3: जोड़ने से पहले हर को परिमेय बनाने की आदत रखें।

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Question 3/20 Expert Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 15

कौन सा विकल्प (\(\sqrt{3}+1\)\(\sqrt{3}-1\)) का सही मान और प्रकार देता है?

Which option gives the correct value and type of (\(\sqrt{3}+1\)\(\sqrt{3}-1\))?

Explanation opens after your attempt
Correct Answer

A. (2) और परिमेय(2) and rational

Step 1

Concept

This is a difference of squares form.

Step 2

Why this answer is correct

(\(\sqrt{3}+1\)\(\sqrt{3}-1\)=3-1=2) which is rational.

Step 3

Exam Tip

Product of conjugates often removes the radical. चरण 1: यह अंतर के वर्ग का रूप है। चरण 2: (\(\sqrt{3}+1\)\(\sqrt{3}-1\)=3-1=2) जो परिमेय है। चरण 3: संयुग्मी पदों का गुणनफल अक्सर वर्गमूल हटा देता है।

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Question 4/20 Expert Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 14

यदि \(a=\sqrt{3}+\sqrt{2}\) और \(b=\sqrt{3}-\sqrt{2}\), तो \(\frac{a-b}{a+b}\) का मान क्या है?

If \(a=\sqrt{3}+\sqrt{2}\) and \(b=\sqrt{3}-\sqrt{2}\), what is the value of \(\frac{a-b}{a+b}\)?

Explanation opens after your attempt
Correct Answer

A. \(\frac{\sqrt{6}}{3}\)

Step 1

Concept

\(a-b=2\sqrt{2}\) and \(a+b=2\sqrt{3}\).

Step 2

Why this answer is correct

\(\frac{a-b}{a+b}=\frac{\sqrt{2}}{\sqrt{3}}=\frac{\sqrt{6}}{3}\).

Step 3

Exam Tip

Do not forget to rationalize the denominator at the end. चरण 1: \(a-b=2\sqrt{2}\) और \(a+b=2\sqrt{3}\)। चरण 2: \(\frac{a-b}{a+b}=\frac{\sqrt{2}}{\sqrt{3}}=\frac{\sqrt{6}}{3}\)। चरण 3: अंत में हर को परिमेय बनाना न भूलें।

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Question 5/20 Expert Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 14

यदि \(x=5-\sqrt{24}\), तो \(\frac{1}{x}\) का सही रूप कौन-सा है?

If \(x=5-\sqrt{24}\), which is the correct form of \(\frac{1}{x}\)?

Explanation opens after your attempt
Correct Answer

A. \(5+\sqrt{24}\)

Step 1

Concept

(\(5-\sqrt{24}\)\(5+\sqrt{24}\)=25-24=1).

Step 2

Why this answer is correct

Therefore \(5+\sqrt{24}\) is the reciprocal of \(5-\sqrt{24}\).

Step 3

Exam Tip

If conjugates multiply to (1), the reciprocal is directly the conjugate. चरण 1: (\(5-\sqrt{24}\)\(5+\sqrt{24}\)=25-24=1)। चरण 2: इसलिए \(5+\sqrt{24}\), \(5-\sqrt{24}\) का व्युत्क्रम है। चरण 3: यदि संयुग्मी गुणन (1) दे, तो व्युत्क्रम सीधे संयुग्मी होता है।

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Question 6/20 Expert Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 14

कौन-सा विकल्प \(\frac{1}{\sqrt{5}+\sqrt{2}}\) का परिमेय हर वाला रूप है?

Which option is the rationalized form of \(\frac{1}{\sqrt{5}+\sqrt{2}}\)?

Explanation opens after your attempt
Correct Answer

A. \(\frac{\sqrt{5}-\sqrt{2}}{3}\)

Step 1

Concept

The conjugate of the denominator is \(\sqrt{5}-\sqrt{2}\).

Step 2

Why this answer is correct

The denominator becomes (5-2=3), so the form is \(\frac{\sqrt{5}-\sqrt{2}}{3}\).

Step 3

Exam Tip

For a sum of two surds, the conjugate changes the sign between them. चरण 1: हर का संयुग्मी \(\sqrt{5}-\sqrt{2}\) है। चरण 2: हर (5-2=3) बनता है, इसलिए रूप \(\frac{\sqrt{5}-\sqrt{2}}{3}\) है। चरण 3: दो मूलों के योग में संयुग्मी का चिह्न बदलता है।

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Question 7/20 Expert Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 14

यदि \(x=2+\sqrt{3}\), तो \(x^2+\frac{1}{x^2}\) का मान क्या है?

If \(x=2+\sqrt{3}\), what is the value of \(x^2+\frac{1}{x^2}\)?

Explanation opens after your attempt
Correct Answer

A. (14)

Step 1

Concept

\(\frac{1}{2+\sqrt{3}}=2-\sqrt{3}\).

Step 2

Why this answer is correct

Hence \(x+\frac{1}{x}=4\), so \(x^2+\frac{1}{x^2}=4^2-2=14\).

Step 3

Exam Tip

Finding \(x+\frac{1}{x}\) first saves long calculation. चरण 1: \(\frac{1}{2+\sqrt{3}}=2-\sqrt{3}\) होता है। चरण 2: इसलिए \(x+\frac{1}{x}=4\), अतः (x-2+\frac{1}{x-2}=(4)2-2=14)। चरण 3: पहले \(x+\frac{1}{x}\) निकालना लंबी गणना बचाता है।

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Question 8/20 Expert Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 14

यदि \(x=\frac{\sqrt{10}+\sqrt{6}}{\sqrt{10}-\sqrt{6}}\), तो (x) का सरल रूप क्या है?

If \(x=\frac{\sqrt{10}+\sqrt{6}}{\sqrt{10}-\sqrt{6}}\), what is the simplified form of (x)?

Explanation opens after your attempt
Correct Answer

A. \(4+\sqrt{15}\)

Step 1

Concept

Multiply by \(\sqrt{10}+\sqrt{6}\) to rationalize the denominator.

Step 2

Why this answer is correct

The numerator becomes (\(\sqrt{10}+\sqrt{6}\)2=16+2\sqrt{60}) and the denominator is (10-6=4), so the value is \(4+\sqrt{15}\).

Step 3

Exam Tip

In conjugate fractions, clear the denominator first. चरण 1: हर को परिमेय बनाने के लिए \(\sqrt{10}+\sqrt{6}\) से गुणा करें। चरण 2: ऊपर (\(\sqrt{10}+\sqrt{6}\)2=16+2\sqrt{60}) और नीचे (10-6=4) मिलता है, इसलिए मान \(4+\sqrt{15}\) है। चरण 3: संयुग्मी वाले भिन्नों में हर को पहले साफ करें।

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Question 9/20 Expert Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 13

यदि \(x=\frac{\sqrt{7}+\sqrt{5}}{\sqrt{7}-\sqrt{5}}+\frac{\sqrt{7}-\sqrt{5}}{\sqrt{7}+\sqrt{5}}\), तो (x) का मान और प्रकृति क्या है?

If \(x=\frac{\sqrt{7}+\sqrt{5}}{\sqrt{7}-\sqrt{5}}+\frac{\sqrt{7}-\sqrt{5}}{\sqrt{7}+\sqrt{5}}\), what is the value and nature of (x)?

Explanation opens after your attempt
Correct Answer

A. (12), परिमेय(12), rational

Step 1

Concept

First observe the common structure and take \(a=\sqrt{7}+\sqrt{5}\) and \(b=\sqrt{7}-\sqrt{5}\).

Step 2

Why this answer is correct

\(\frac{a}{b}+\frac{b}{a}=\frac{a^2+b^2}{ab}\). Here \(a^2+b^2=24\) and (ab=2), so (x=12).

Step 3

Exam Tip

For fractions with conjugate surds, use substitution instead of expanding everything directly. चरण 1: पहले दोनों भिन्नों का साझा रूप देखें और \(a=\sqrt{7}+\sqrt{5}\) तथा \(b=\sqrt{7}-\sqrt{5}\) मानें। चरण 2: \(\frac{a}{b}+\frac{b}{a}=\frac{a^2+b^2}{ab}\) होगा। यहाँ \(a^2+b^2=24\) और (ab=2) इसलिए (x=12) है। चरण 3: संयुग्मी मूलों वाले भिन्नों में सीधे लंबा प्रसार करने के बजाय (a) और (b) रखकर हल करें।

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Question 10/20 Expert Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 13

यदि \(x=\sqrt{6}+\sqrt{2}\) और \(y=\sqrt{6}-\sqrt{2}\), तो \(\frac{x}{y}\) का सरल रूप क्या है?

If \(x=\sqrt{6}+\sqrt{2}\) and \(y=\sqrt{6}-\sqrt{2}\), what is the simplified form of \(\frac{x}{y}\)?

Explanation opens after your attempt
Correct Answer

A. \(2+\sqrt{3}\)

Step 1

Concept

Rationalize the denominator of \(\frac{\sqrt{6}+\sqrt{2}}{\sqrt{6}-\sqrt{2}}\).

Step 2

Why this answer is correct

The numerator becomes (\(\sqrt{6}+\sqrt{2}\)2=8+4\sqrt{3}), and the denominator is (6-2=4), so the value is \(2+\sqrt{3}\).

Step 3

Exam Tip

Multiplying by the conjugate is effective in such quotients. चरण 1: \(\frac{\sqrt{6}+\sqrt{2}}{\sqrt{6}-\sqrt{2}}\) में हर को संयुग्मी से परिमेय करें। चरण 2: ऊपर (\(\sqrt{6}+\sqrt{2}\)2=8+4\sqrt{3}) और नीचे (6-2=4), इसलिए मान \(2+\sqrt{3}\) है। चरण 3: भाग में संयुग्मी से गुणा करना प्रभावी तरीका है।

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Question 11/20 Expert Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 13

कौन-सा विकल्प \(\frac{2+\sqrt{3}}{2-\sqrt{3}}\) के सही सरल रूप के बराबर है?

Which option is equal to the simplified form of \(\frac{2+\sqrt{3}}{2-\sqrt{3}}\)?

Explanation opens after your attempt
Correct Answer

A. \(7+4\sqrt{3}\)

Step 1

Concept

Multiply by \(2+\sqrt{3}\) to rationalize the denominator.

Step 2

Why this answer is correct

(\frac{\(2+\sqrt{3}\)2}{4-3}=4+4\sqrt{3}+3=7+4\sqrt{3}).

Step 3

Exam Tip

When multiplying by the conjugate, the numerator may become a full square. चरण 1: हर को परिमेय बनाने के लिए \(2+\sqrt{3}\) से गुणा करें। चरण 2: (\frac{\(2+\sqrt{3}\)2}{4-3}=4+4\sqrt{3}+3=7+4\sqrt{3})। चरण 3: संयुग्मी से गुणा करते समय ऊपर भी पूरा वर्ग बनता है।

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Question 12/20 Expert Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 13

यदि \(x=\sqrt{5}+\sqrt{3}\), तो \(x-\frac{2}{x}\) का मान क्या है?

If \(x=\sqrt{5}+\sqrt{3}\), what is the value of \(x-\frac{2}{x}\)?

Explanation opens after your attempt
Correct Answer

A. \(2\sqrt{3}\)

Step 1

Concept

\(\frac{1}{\sqrt{5}+\sqrt{3}}=\frac{\sqrt{5}-\sqrt{3}}{2}\).

Step 2

Why this answer is correct

Therefore \(\frac{2}{x}=\sqrt{5}-\sqrt{3}\).

Step 3

Exam Tip

(x-\frac{2}{x}=\(\sqrt{5}+\sqrt{3}\)-\(\sqrt{5}-\sqrt{3}\)=2\sqrt{3}). चरण 1: \(\frac{1}{\sqrt{5}+\sqrt{3}}=\frac{\sqrt{5}-\sqrt{3}}{2}\) होता है। चरण 2: इसलिए \(\frac{2}{x}=\sqrt{5}-\sqrt{3}\)। चरण 3: (x-\frac{2}{x}=\(\sqrt{5}+\sqrt{3}\)-\(\sqrt{5}-\sqrt{3}\)=2\sqrt{3})।

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Question 13/20 Expert Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 13

यदि \(x=2+\sqrt{3}\), तो \(x+\frac{1}{x}\) का मान क्या है?

If \(x=2+\sqrt{3}\), what is the value of \(x+\frac{1}{x}\)?

Explanation opens after your attempt
Correct Answer

A. (4)

Step 1

Concept

\(\frac{1}{2+\sqrt{3}}=2-\sqrt{3}\).

Step 2

Why this answer is correct

(x+\frac{1}{x}=\(2+\sqrt{3}\)+\(2-\sqrt{3}\)=4).

Step 3

Exam Tip

Recognizing the conjugate reciprocal saves long calculation. चरण 1: \(\frac{1}{2+\sqrt{3}}=2-\sqrt{3}\) होता है। चरण 2: (x+\frac{1}{x}=\(2+\sqrt{3}\)+\(2-\sqrt{3}\)=4)। चरण 3: संयुग्मी व्युत्क्रम को पहचानने से लंबी गणना बचती है।

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Question 14/20 Expert Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 13

यदि \(x=\sqrt{3}+\sqrt{2}\), तो \(\frac{1}{x}\) का परिमेय हर वाला रूप कौन-सा है?

If \(x=\sqrt{3}+\sqrt{2}\), which is the rationalized form of \(\frac{1}{x}\)?

Explanation opens after your attempt
Correct Answer

A. \(\sqrt{3}-\sqrt{2}\)

Step 1

Concept

The conjugate of \(\sqrt{3}+\sqrt{2}\) is \(\sqrt{3}-\sqrt{2}\).

Step 2

Why this answer is correct

The denominator becomes (3-2=1), so \(\frac{1}{\sqrt{3}+\sqrt{2}}=\sqrt{3}-\sqrt{2}\).

Step 3

Exam Tip

When the difference of the squared surds is (1), the result becomes very simple. चरण 1: \(\sqrt{3}+\sqrt{2}\) का संयुग्मी \(\sqrt{3}-\sqrt{2}\) है। चरण 2: हर (3-2=1) बनता है, इसलिए \(\frac{1}{\sqrt{3}+\sqrt{2}}=\sqrt{3}-\sqrt{2}\)। चरण 3: जिन दो मूलों के वर्गों का अंतर (1) हो, वहाँ उत्तर बहुत सरल आता है।

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Question 15/20 Expert Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 13

यदि \(x=\frac{1}{\sqrt{6}-\sqrt{5}}\), तो (x) किसके बराबर है?

If \(x=\frac{1}{\sqrt{6}-\sqrt{5}}\), what is (x) equal to?

Explanation opens after your attempt
Correct Answer

A. \(\sqrt{6}+\sqrt{5}\)

Step 1

Concept

The conjugate of the denominator is \(\sqrt{6}+\sqrt{5}\).

Step 2

Why this answer is correct

The denominator becomes (\(\sqrt{6}\)2-\(\sqrt{5}\)2=6-5=1).

Step 3

Exam Tip

When the denominator is a difference of two surds, multiply by its conjugate. चरण 1: हर का संयुग्मी \(\sqrt{6}+\sqrt{5}\) है। चरण 2: हर (\(\sqrt{6}\)2-\(\sqrt{5}\)2=6-5=1) बनता है। चरण 3: जब हर में दो मूलों का अंतर हो, तो संयुग्मी से गुणा करें।

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Question 16/20 Hard Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 15

कौन-सी संख्या \(\frac{2}{\sqrt{2}+1}\) के बराबर है?

Which number is equal to \(\frac{2}{\sqrt{2}+1}\)?

Explanation opens after your attempt
Correct Answer

A. \(2\sqrt{2}-2\)

Step 1

Concept

The conjugate of the denominator is \(\sqrt{2}-1\).

Step 2

Why this answer is correct

(\frac{2}{\sqrt{2}+1}\times\frac{\sqrt{2}-1}{\sqrt{2}-1}=\frac{2\(\sqrt{2}-1\)}{2-1}=2\sqrt{2}-2).

Step 3

Exam Tip

Choosing the correct conjugate sign is very important. चरण 1: हर का संयुग्मी \(\sqrt{2}-1\) है। चरण 2: (\frac{2}{\sqrt{2}+1}\times\frac{\sqrt{2}-1}{\sqrt{2}-1}=\frac{2\(\sqrt{2}-1\)}{2-1}=2\sqrt{2}-2)। चरण 3: संयुग्मी का सही चिह्न चुनना बहुत जरूरी है।

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Question 17/20 Hard Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 15

यदि \(x=2-\sqrt{3}\), तो \(\frac{1}{x}\) का परिमेय हर वाला रूप क्या है?

If \(x=2-\sqrt{3}\), what is the rationalized form of \(\frac{1}{x}\)?

Explanation opens after your attempt
Correct Answer

A. \(2+\sqrt{3}\)

Step 1

Concept

The conjugate of the denominator in \(\frac{1}{2-\sqrt{3}}\) is \(2+\sqrt{3}\).

Step 2

Why this answer is correct

\(\frac{1}{2-\sqrt{3}}\times\frac{2+\sqrt{3}}{2+\sqrt{3}}=\frac{2+\sqrt{3}}{4-3}=2+\sqrt{3}\).

Step 3

Exam Tip

Multiplying by the conjugate removes the radical from the denominator. चरण 1: \(\frac{1}{2-\sqrt{3}}\) में हर का संयुग्मी \(2+\sqrt{3}\) है। चरण 2: \(\frac{1}{2-\sqrt{3}}\times\frac{2+\sqrt{3}}{2+\sqrt{3}}=\frac{2+\sqrt{3}}{4-3}=2+\sqrt{3}\)। चरण 3: हर में संयुग्मी से गुणा करने पर मूल हट जाता है।

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Question 18/20 Hard Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 15

कौन-सा विकल्प \(\frac{3}{2+\sqrt{5}}\) का परिमेय हर वाला रूप है?

Which option is the rationalized form of \(\frac{3}{2+\sqrt{5}}\)?

Explanation opens after your attempt
Correct Answer

B. (3\(\sqrt{5}-2\))

Step 1

Concept

The conjugate of the denominator is \(2-\sqrt{5}\).

Step 2

Why this answer is correct

(\frac{3}{2+\sqrt{5}}\times\frac{2-\sqrt{5}}{2-\sqrt{5}}=\frac{3\(2-\sqrt{5}\)}{4-5}=3\(\sqrt{5}-2\)).

Step 3

Exam Tip

Use the difference of squares in the denominator when multiplying by a conjugate. चरण 1: हर का संयुग्मी \(2-\sqrt{5}\) है। चरण 2: (\frac{3}{2+\sqrt{5}}\times\frac{2-\sqrt{5}}{2-\sqrt{5}}=\frac{3\(2-\sqrt{5}\)}{4-5}=3\(\sqrt{5}-2\))। चरण 3: संयुग्मी से गुणा करते समय हर में अंतर के वर्ग का प्रयोग करें।

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Question 19/20 Hard Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 14

यदि \(x=\frac{2}{\sqrt{5}}\), तो (x) की प्रकृति क्या है?

If \(x=\frac{2}{\sqrt{5}}\), what is the nature of (x)?

Explanation opens after your attempt
Correct Answer

B. अपरिमेयIrrational

Step 1

Concept

The denominator has \(\sqrt{5}\), which is irrational.

Step 2

Why this answer is correct

Rationalizing gives \(x=\frac{2\sqrt{5}}{5}\), a non-zero rational multiple of an irrational number.

Step 3

Exam Tip

Rationalizing the denominator often reveals the number type clearly. चरण 1: हर में \(\sqrt{5}\) है, जो अपरिमेय है। चरण 2: हर को परिमेय बनाने पर \(x=\frac{2\sqrt{5}}{5}\) मिलेगा, जो अशून्य परिमेय गुणक के साथ अपरिमेय है। चरण 3: हर परिमेय बनाने से संख्या की प्रकृति साफ दिखती है।

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Question 20/20 Hard Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 14

कौन-सा विकल्प \(\frac{1}{\sqrt{3}}\) का परिमेय हर वाला रूप है?

Which option is the rationalized form of \(\frac{1}{\sqrt{3}}\)?

Explanation opens after your attempt
Correct Answer

A. \(\frac{\sqrt{3}}{3}\)

Step 1

Concept

Multiply numerator and denominator by \(\sqrt{3}\).

Step 2

Why this answer is correct

\(\frac{1}{\sqrt{3}}\times\frac{\sqrt{3}}{\sqrt{3}}=\frac{\sqrt{3}}{3}\).

Step 3

Exam Tip

Rationalizing the denominator gives a cleaner exam answer. चरण 1: हर को परिमेय बनाने के लिए ऊपर और नीचे \(\sqrt{3}\) से गुणा करें। चरण 2: \(\frac{1}{\sqrt{3}}\times\frac{\sqrt{3}}{\sqrt{3}}=\frac{\sqrt{3}}{3}\)। चरण 3: हर को मूल से मुक्त करना परीक्षा में साफ उत्तर देता है।

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