handshakes in party.......!
Probability
Level
pending
There were 11 celebrities in the party and each one of them has to shake their hands with one another. how many handshakes are possible ??
The answer is 55.
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1 solution
nCr = n(n - 1) / 2
substituting for n = 11, we have
11 * (10) / 2 = 55