\(यदि (U={1,2,\ldots,50}), (A={x:x\in U,x\) 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
Correct Answer

A. (40)

Step 1

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).

Step 2

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).

Step 3

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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Mathematics Answer, Explanation and Revision Hints

\(यदि (U={1,2,\ldots,50}), (A={x:x\in U,x\) 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'))?

Correct Answer: A. (40). Explanation: ऐसी संख्याएं (2,7,12,17,22,27,32,37,42,47) हैं, यानी (10) सदस्य। इसलिए (n(A')=50-10=40) है। / Such numbers are (2,7,12,17,22,27,32,37,42,47), so there are (10) elements. Hence (n(A')=50-10=40).

Which concept should I revise for this Mathematics MCQ?

Such numbers are (2,7,12,17,22,27,32,37,42,47), so there are (10) elements. Hence (n(A')=50-10=40).

What exam hint can help solve this Mathematics question?

ऐसी संख्याएं (2,7,12,17,22,27,32,37,42,47) हैं, यानी (10) सदस्य। इसलिए (n(A')=50-10=40) है।