\(यदि (U={1,2,\ldots,25}), (A={x:x \in U,x\) का कोई भाजक 5 है}), तो (A') में अभाज्य संख्याओं की संख्या कितनी है?
\(If (U={1,2,\ldots,25}), (A={x:x \in U,5\) is a divisor of x}), how many prime numbers are in (A')?
Explanation opens after your attempt
Correct Answer
A. (7)
Concept
There are (9) primes up to (25), and (5) must be removed. Multiples of (5) are not in (A'), so (7) primes remain.
Why this answer is correct
The correct answer is A. (7). There are (9) primes up to (25), and (5) must be removed. Multiples of (5) are not in (A'), so (7) primes remain.
Exam Tip
(25) तक अभाज्य संख्याएं (9) हैं और उनमें (5) को हटाना होगा। (A') में (5) के गुणज नहीं आते, इसलिए (7) अभाज्य बचते हैं।
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