यदि \(U={1,2,\ldots,70}\), \(A={x:x \in U,2\mid x}\), \(B={x:x \in U,7\mid x}\), तो (n((A-B)')) क्या है?
If \(U={1,2,\ldots,70}\), \(A={x:x \in U,2\mid x}\), \(B={x:x \in U,7\mid x}\), what is (n((A-B)'))?
Explanation opens after your attempt
Correct Answer
A. (40)
Concept
(A-B) contains even numbers not divisible by (7), and their count is (35-5=30). Therefore the complement has (70-30=40) elements.
Why this answer is correct
The correct answer is A. (40). (A-B) contains even numbers not divisible by (7), and their count is (35-5=30). Therefore the complement has (70-30=40) elements.
Exam Tip
(A-B) में वे सम संख्याएं हैं जो (7) से विभाज्य नहीं हैं, उनकी संख्या (35-5=30) है। इसलिए पूरक (70-30=40) है।
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