Five members were present at a board meeting. Each member shook hands with all of the other members before the meeting. How many handshakes took place ?
Correct Answer: Option A
মোট সদস্য = ৫ জন এবং প্রতিবার হ্যান্ডশেক করার জন্য লোকের প্রয়োজন ২ জন ।
তাহলে হ্যান্ডশেক হবে = \(^n{C_{r\;}}{ = ^5}{C_{2\;}} = \frac{{5!}}{{2! \times \left( {5 - 2} \right)!}} = \frac{{5 \times 4 \times 3!}}{{2 \times 3!}} = \frac{{5 \times 4!}}{2} = 10\)
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