यदि \(A=\{1,2,3,4,5\}\), तो (A) के ऐसे उपसमुच्चयों की संख्या कितनी है जिनमें ठीक 2 अवयव हों और 5 न हो?
If \(A=\{1,2,3,4,5\}\), how many subsets have exactly 2 elements and do not contain 5?
Explanation opens after your attempt
B. 6
Concept
Exclude 5 and choose 2 elements from ({1,2,3,4}). The number is \(\binom{4}{2}=6\).
Why this answer is correct
The correct answer is B. 6. Exclude 5 and choose 2 elements from ({1,2,3,4}). The number is \(\binom{4}{2}=6\).
Exam Tip
5 को छोड़कर ({1,2,3,4}) से 2 अवयव चुनने हैं। संख्या \(\binom{4}{2}=6\) है।
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