(6) दोस्तों में से (2) दोस्तों की जोड़ी कितने तरीकों से चुनी जा सकती है?
In how many ways can a pair of friends be selected from (6) friends?
Explanation opens after your attempt
B. (15)
Concept
For a pair, \(\binom{6}{2}=15\). In a pair, first and second are not counted separately.
Why this answer is correct
The correct answer is B. (15). For a pair, \(\binom{6}{2}=15\). In a pair, first and second are not counted separately.
Exam Tip
जोड़ी के लिए \(\binom{6}{2}=15\) होगा। जोड़ी में पहला और दूसरा अलग नहीं गिने जाते।
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