यदि \(A=\{1,3,9\}\) है तो (\mathcal{P}(A)) में कितने उपसमुच्चय ({1,9}) को शामिल करेंगे?

If \(A=\{1,3,9\}\), how many subsets in (\mathcal{P}(A)) will include ({1,9})?

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Correct Answer

B. (2)

Step 1

Concept

Keeping (1) and (9) is fixed and (3) can be taken or not taken in (2) ways. So there are (2) such subsets.

Step 2

Why this answer is correct

The correct answer is B. (2). Keeping (1) and (9) is fixed and (3) can be taken or not taken in (2) ways. So there are (2) such subsets.

Step 3

Exam Tip

(1) और (9) रखना तय है और (3) को लेने या न लेने के (2) तरीके हैं। इसलिए ऐसे (2) उपसमुच्चय हैं।

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Mathematics Answer, Explanation and Revision Hints

यदि \(A=\{1,3,9\}\) है तो (\mathcal{P}(A)) में कितने उपसमुच्चय ({1,9}) को शामिल करेंगे? / If \(A=\{1,3,9\}\), how many subsets in (\mathcal{P}(A)) will include ({1,9})?

Correct Answer: B. (2). Explanation: (1) और (9) रखना तय है और (3) को लेने या न लेने के (2) तरीके हैं। इसलिए ऐसे (2) उपसमुच्चय हैं। / Keeping (1) and (9) is fixed and (3) can be taken or not taken in (2) ways. So there are (2) such subsets.

Which concept should I revise for this Mathematics MCQ?

Keeping (1) and (9) is fixed and (3) can be taken or not taken in (2) ways. So there are (2) such subsets.

What exam hint can help solve this Mathematics question?

(1) और (9) रखना तय है और (3) को लेने या न लेने के (2) तरीके हैं। इसलिए ऐसे (2) उपसमुच्चय हैं।