Shaking hands
Probability
Level
1
A group of ten students shake hands one another among themselves. What is the total number of shaking hands?
The answer is 45.
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1 solution
First student will shake hand with remaining nine students.. Second student will shake hand with remaining eight students.. .. .. .. Ninth student will shake hand with tenth student... so, on adding all above we get, 9+8+7+6+5+4+3+2+1 = 45