\(यदि (U={1,2,\ldots,50}), (A={x:x\in U,x\) का अंतिम अंक 2 या 7 है}), तो (n(A')) क्या है?
\(If (U={1,2,\ldots,50}), (A={x:x\in U\), the last digit of x is 2 or 7}), what is (n(A'))?
Explanation opens after your attempt
A. (40)
Concept
Such numbers are (2,7,12,17,22,27,32,37,42,47), so there are (10) elements. Hence (n(A')=50-10=40).
Why this answer is correct
The correct answer is A. (40). Such numbers are (2,7,12,17,22,27,32,37,42,47), so there are (10) elements. Hence (n(A')=50-10=40).
Exam Tip
ऐसी संख्याएं (2,7,12,17,22,27,32,37,42,47) हैं, यानी (10) सदस्य। इसलिए (n(A')=50-10=40) है।
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