Discuss Forum
1. 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?
- A. 10
- B. 10
- C. 10
- D. 10
Answer: Option A
Explanation:
আমরা জানি,
n সংখ্যক লোক যদি পরস্পরের সাথে handshake করে তাহলে handshake এর সংখ্যা হয় = n(n - 1)2
মোট 5 জন লোজ হলে এর সংখ্যা হবে = n(n - 1)2 = 5(5 - 1)2 = 10
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