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1. If 10 person shake their hands with each other , then total number of handshakes are --
- A. 100
- B. 100
- C. 100
- D. 100
Answer: Option D
Explanation:
১ম ব্যক্তি অবশিষ্ট 9 জনের সাথে handshake করে
২য় ,, ,, 8 ,, ,, ,, ,,
৩য় ,, ,, 7 ,, ,, ,, ,,
⸫ Total Handshake = n(n−1)2=10(10−1)2=45�(�-1)2=10(10-1)2=45
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