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cubic_rule MCQ Questions for Class 9

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

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2 questions tagged with cubic_rule.

Question 1/2 Hard Mathematics Sequences and Progressions Sequences Class 9 Level 43

यदि \(a_n=n^3-2n\) है, तो \(a_5\) क्या होगा?

If \(a_n=n^3-2n\), what is \(a_5\)?

Explanation opens after your attempt
Correct Answer

C. (115)

Step 1

Concept

Putting (n=5), (a_5=53-2(5)=115). Handle the cube and multiplication carefully.

Step 2

Why this answer is correct

The correct answer is C. (115). Putting (n=5), (a_5=53-2(5)=115). Handle the cube and multiplication carefully.

Step 3

Exam Tip

(n=5) रखने पर (a_5=53-2(5)=115) है। घन और गुणा दोनों सावधानी से करें।

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Question 2/2 Hard Mathematics Sequences and Progressions Sequences Class 9 Level 42

यदि \(a_n=n^3+n\) है, तो \(a_4\) क्या होगा?

If \(a_n=n^3+n\), what is \(a_4\)?

Explanation opens after your attempt
Correct Answer

C. (68)

Step 1

Concept

Putting (n=4), \(a_4=4^3+4=68\). First find the cube, then add.

Step 2

Why this answer is correct

The correct answer is C. (68). Putting (n=4), \(a_4=4^3+4=68\). First find the cube, then add.

Step 3

Exam Tip

(n=4) रखने पर \(a_4=4^3+4=68\) है। पहले घन निकालें, फिर जोड़ करें।

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