Expert Mathematics Relations and Functions Class 12 Level 20

यदि \(f:A\to B\) एकैकी है और (A) में (6) अवयव हैं, तो (f(A)) में कितने अवयव होंगे?

If \(f:A\to B\) is one-one and (A) has (6) elements, how many elements will (f(A)) have?

Explanation opens after your attempt
Correct Answer

C. (6)

Step 1

Concept

In a one-one function, distinct elements of (A) have distinct images.

Step 2

Why this answer is correct

Since (A) has (6) elements, there will be (6) distinct images.

Step 3

Exam Tip

Therefore (f(A)) has (6) elements. चरण 1: एकैकी फलन में अलग-अलग (A) अवयवों के प्रतिबिंब अलग-अलग होते हैं। चरण 2: (A) में (6) अवयव हैं, इसलिए (6) अलग प्रतिबिंब मिलेंगे। चरण 3: अतः (f(A)) में (6) अवयव होंगे।

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Mathematics Answer, Explanation and Revision Hints

यदि \(f:A\to B\) एकैकी है और (A) में (6) अवयव हैं, तो (f(A)) में कितने अवयव होंगे? / If \(f:A\to B\) is one-one and (A) has (6) elements, how many elements will (f(A)) have?

Correct Answer: C. (6). Explanation: चरण 1: एकैकी फलन में अलग-अलग (A) अवयवों के प्रतिबिंब अलग-अलग होते हैं। चरण 2: (A) में (6) अवयव हैं, इसलिए (6) अलग प्रतिबिंब मिलेंगे। चरण 3: अतः (f(A)) में (6) अवयव होंगे। / Step 1: In a one-one function, distinct elements of (A) have distinct images. Step 2: Since (A) has (6) elements, there will be (6) distinct images. Step 3: Therefore (f(A)) has (6) elements.

Which concept should I revise for this Mathematics MCQ?

In a one-one function, distinct elements of (A) have distinct images.

What exam hint can help solve this Mathematics question?

Therefore (f(A)) has (6) elements. चरण 1: एकैकी फलन में अलग-अलग (A) अवयवों के प्रतिबिंब अलग-अलग होते हैं। चरण 2: (A) में (6) अवयव हैं, इसलिए (6) अलग प्रतिबिंब मिलेंगे। चरण 3: अतः (f(A)) में (6) अवयव होंगे।

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