If there are 30 people in a room and if they all will shake hands with each other. Then how many hand shakes will take place in that room? Explain.
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The total number of handshakes between "n" people can be defined as S = [(n - 1)(n - 1 + 1)]/2 or (n(n - 1)/2.
=[30(30-1)/2]
=[30*29/2]
=(15*29)
=435
So the total no of handshakes are 435
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