(13) अभ्यर्थियों में से अध्यक्ष और उपाध्यक्ष चुनने के तरीके कितने हैं?

In how many ways can a president and vice-president be chosen from (13) candidates?

Explanation opens after your attempt
Correct Answer

B. (156)

Step 1

Concept

The two posts are distinct, so \({}^{13}P_{2}=13\times12=156\). Do not use combination when posts are different.

Step 2

Why this answer is correct

The correct answer is B. (156). The two posts are distinct, so \({}^{13}P_{2}=13\times12=156\). Do not use combination when posts are different.

Step 3

Exam Tip

दो पद अलग हैं इसलिए \({}^{13}P_{2}=13\times12=156\)। पद अलग हों तो combination नहीं लगाएं।

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Mathematics Answer, Explanation and Revision Hints

(13) अभ्यर्थियों में से अध्यक्ष और उपाध्यक्ष चुनने के तरीके कितने हैं? / In how many ways can a president and vice-president be chosen from (13) candidates?

Correct Answer: B. (156). Explanation: दो पद अलग हैं इसलिए \({}^{13}P_{2}=13\times12=156\)। पद अलग हों तो combination नहीं लगाएं। / The two posts are distinct, so \({}^{13}P_{2}=13\times12=156\). Do not use combination when posts are different.

Which concept should I revise for this Mathematics MCQ?

The two posts are distinct, so \({}^{13}P_{2}=13\times12=156\). Do not use combination when posts are different.

What exam hint can help solve this Mathematics question?

दो पद अलग हैं इसलिए \({}^{13}P_{2}=13\times12=156\)। पद अलग हों तो combination नहीं लगाएं।