यदि (n(A)=5) और (n\(A\times B\)=35) है, तो (n(B)) कितना होगा?

If (n(A)=5) and (n\(A\times B\)=35), what is (n(B))?

Explanation opens after your attempt
Correct Answer

A. (7)

Step 1

Concept

(n\(A\times B\)=n(A)n(B)), so (35=5n(B)) and (n(B)=7). In such questions, use the formula in reverse too.

Step 2

Why this answer is correct

The correct answer is A. (7). (n\(A\times B\)=n(A)n(B)), so (35=5n(B)) and (n(B)=7). In such questions, use the formula in reverse too.

Step 3

Exam Tip

(n\(A\times B\)=n(A)n(B)), इसलिए (35=5n(B)) और (n(B)=7)। ऐसे प्रश्नों में सूत्र को उल्टा भी लगाएं।

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Mathematics Answer, Explanation and Revision Hints

यदि (n(A)=5) और (n\(A\times B\)=35) है, तो (n(B)) कितना होगा? / If (n(A)=5) and (n\(A\times B\)=35), what is (n(B))?

Correct Answer: A. (7). Explanation: (n\(A\times B\)=n(A)n(B)), इसलिए (35=5n(B)) और (n(B)=7)। ऐसे प्रश्नों में सूत्र को उल्टा भी लगाएं। / (n\(A\times B\)=n(A)n(B)), so (35=5n(B)) and (n(B)=7). In such questions, use the formula in reverse too.

Which concept should I revise for this Mathematics MCQ?

(n\(A\times B\)=n(A)n(B)), so (35=5n(B)) and (n(B)=7). In such questions, use the formula in reverse too.

What exam hint can help solve this Mathematics question?

(n\(A\times B\)=n(A)n(B)), इसलिए (35=5n(B)) और (n(B)=7)। ऐसे प्रश्नों में सूत्र को उल्टा भी लगाएं।