यदि (n(A)=4) और (n\(A\times B\)=20) है, तो (n(B)) कितना होगा?

If (n(A)=4) and (n\(A\times B\)=20), what is (n(B))?

Explanation opens after your attempt
Correct Answer

A. (5)

Step 1

Concept

(n\(A\times B\)=n(A)n(B)), so (20=4n(B)) and (n(B)=5). Use the multiplication formula directly in such questions.

Step 2

Why this answer is correct

The correct answer is A. (5). (n\(A\times B\)=n(A)n(B)), so (20=4n(B)) and (n(B)=5). Use the multiplication formula directly in such questions.

Step 3

Exam Tip

(n\(A\times B\)=n(A)n(B)), इसलिए (20=4n(B)) और (n(B)=5)। ऐसे प्रश्नों में गुणन सूत्र सीधे लगाएं।

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Mathematics Answer, Explanation and Revision Hints

यदि (n(A)=4) और (n\(A\times B\)=20) है, तो (n(B)) कितना होगा? / If (n(A)=4) and (n\(A\times B\)=20), what is (n(B))?

Correct Answer: A. (5). Explanation: (n\(A\times B\)=n(A)n(B)), इसलिए (20=4n(B)) और (n(B)=5)। ऐसे प्रश्नों में गुणन सूत्र सीधे लगाएं। / (n\(A\times B\)=n(A)n(B)), so (20=4n(B)) and (n(B)=5). Use the multiplication formula directly in such questions.

Which concept should I revise for this Mathematics MCQ?

(n\(A\times B\)=n(A)n(B)), so (20=4n(B)) and (n(B)=5). Use the multiplication formula directly in such questions.

What exam hint can help solve this Mathematics question?

(n\(A\times B\)=n(A)n(B)), इसलिए (20=4n(B)) और (n(B)=5)। ऐसे प्रश्नों में गुणन सूत्र सीधे लगाएं।