\(यदि (U={1,2,\ldots,22}), (A={x:x \in U,x\) अभाज्य है}), तो (A') में कितनी विषम संख्याएं हैं?
\(If (U={1,2,\ldots,22}), (A={x:x \in U,x\) is prime}), how many odd numbers are in (A')?
Explanation opens after your attempt
Correct Answer
A. (4)
Concept
There are (11) odd numbers up to (22). Removing odd primes (3,5,7,11,13,17,19) leaves (4) odd non-prime numbers including (1).
Why this answer is correct
The correct answer is A. (4). There are (11) odd numbers up to (22). Removing odd primes (3,5,7,11,13,17,19) leaves (4) odd non-prime numbers including (1).
Exam Tip
(22) तक विषम संख्याएं (11) हैं। उनमें अभाज्य विषम (3,5,7,11,13,17,19) हटेंगे, इसलिए (4) विषम मिश्रित या (1) बचते हैं।
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