\(यदि (U={1,2,\ldots,20}), (A={x:x\) 3 से विभाज्य है}), तो (A') में अवयवों की संख्या कितनी है?
\(If (U={1,2,\ldots,20}), (A={x:x\) is divisible by 3}), how many elements are in (A')?
Explanation opens after your attempt
B. (14)
Concept
There are (6) multiples of (3) up to (20), so (A') has (20-6=14) elements. For complement count, subtract from the total.
Why this answer is correct
The correct answer is B. (14). There are (6) multiples of (3) up to (20), so (A') has (20-6=14) elements. For complement count, subtract from the total.
Exam Tip
(20) तक (3) के (6) गुणज हैं, इसलिए (A') में (20-6=14) अवयव हैं। पूरक की संख्या के लिए कुल में से घटाएं।
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