\(यदि (U={1,2,\ldots,49}) और (A={x:x\in U,x\) पूर्ण वर्ग है}), तो (A') में (7) से विभाज्य संख्याओं की संख्या कितनी है?
\(If (U={1,2,\ldots,49}) and (A={x:x\in U,x\) is a perfect square}), how many numbers divisible by (7) are in (A')?
Explanation opens after your attempt
Correct Answer
A. (5)
Concept
The multiples of (7) are (7,14,21,28,35,42,49). Only (49) is a perfect square, so (6) elements are in (A').
Why this answer is correct
The correct answer is A. (5). The multiples of (7) are (7,14,21,28,35,42,49). Only (49) is a perfect square, so (6) elements are in (A').
Exam Tip
(7) के गुणज (7,14,21,28,35,42,49) हैं। इनमें केवल (49) पूर्ण वर्ग है, इसलिए (6) नहीं बल्कि (6) सदस्य (A') में हैं।
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