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