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
A. (5)
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.
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.
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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