यदि \(A=\{-3,-2,-1,0,1,2,3\}\) और \(B=\{0,1,4,9\}\) हैं, तो \(A\times B\) में कितने युग्म ((a,b)) ऐसे हैं जिनमें \(a^2=b\) है?
If \(A=\{-3,-2,-1,0,1,2,3\}\) and \(B=\{0,1,4,9\}\), how many pairs ((a,b)) in \(A\times B\) satisfy \(a^2=b\)?
Explanation opens after your attempt
D. (7)
Concept
For every \(a\in A\), \(a^2\) is in (B), so (7) pairs are formed. Watch squares of negative numbers carefully.
Why this answer is correct
The correct answer is D. (7). For every \(a\in A\), \(a^2\) is in (B), so (7) pairs are formed. Watch squares of negative numbers carefully.
Exam Tip
हर \(a\in A\) का \(a^2\) (B) में है, इसलिए (7) युग्म बनते हैं। ऋणात्मक संख्याओं के वर्ग को ध्यान से देखें।
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