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
Correct Answer

B. 6

Step 1

Concept

Exclude 5 and choose 2 elements from ({1,2,3,4}). The number is \(\binom{4}{2}=6\).

Step 2

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 \(\binom{4}{2}=6\).

Step 3

Exam Tip

5 को छोड़कर ({1,2,3,4}) से 2 अवयव चुनने हैं। संख्या \(\binom{4}{2}=6\) है।

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Mathematics Answer, Explanation and Revision Hints

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?

Correct Answer: B. 6. Explanation: 5 को छोड़कर ({1,2,3,4}) से 2 अवयव चुनने हैं। संख्या \(\binom{4}{2}=6\) है। / Exclude 5 and choose 2 elements from ({1,2,3,4}). The number is \(\binom{4}{2}=6\).

Which concept should I revise for this Mathematics MCQ?

Exclude 5 and choose 2 elements from ({1,2,3,4}). The number is \(\binom{4}{2}=6\).

What exam hint can help solve this Mathematics question?

5 को छोड़कर ({1,2,3,4}) से 2 अवयव चुनने हैं। संख्या \(\binom{4}{2}=6\) है।