यदि \(A=\{1,2,3\}\) है तो (\mathcal{P}(A)) में कुल कितने समुच्चय (1) को रखते हैं?

If \(A=\{1,2,3\}\), how many sets in (\mathcal{P}(A)) contain (1)?

Explanation opens after your attempt
Correct Answer

C. (4)

Step 1

Concept

Keep (1) fixed and choose or not choose the remaining (2) elements in \(2^2=4\) ways. So there are (4) such subsets.

Step 2

Why this answer is correct

The correct answer is C. (4). Keep (1) fixed and choose or not choose the remaining (2) elements in \(2^2=4\) ways. So there are (4) such subsets.

Step 3

Exam Tip

(1) को स्थिर रखकर बाकी (2) तत्वों को चुनने या न चुनने के \(2^2=4\) तरीके हैं। इसलिए ऐसे (4) उपसमुच्चय हैं।

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Mathematics Answer, Explanation and Revision Hints

यदि \(A=\{1,2,3\}\) है तो (\mathcal{P}(A)) में कुल कितने समुच्चय (1) को रखते हैं? / If \(A=\{1,2,3\}\), how many sets in (\mathcal{P}(A)) contain (1)?

Correct Answer: C. (4). Explanation: (1) को स्थिर रखकर बाकी (2) तत्वों को चुनने या न चुनने के \(2^2=4\) तरीके हैं। इसलिए ऐसे (4) उपसमुच्चय हैं। / Keep (1) fixed and choose or not choose the remaining (2) elements in \(2^2=4\) ways. So there are (4) such subsets.

Which concept should I revise for this Mathematics MCQ?

Keep (1) fixed and choose or not choose the remaining (2) elements in \(2^2=4\) ways. So there are (4) such subsets.

What exam hint can help solve this Mathematics question?

(1) को स्थिर रखकर बाकी (2) तत्वों को चुनने या न चुनने के \(2^2=4\) तरीके हैं। इसलिए ऐसे (4) उपसमुच्चय हैं।