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12 members were present at a board meeting. Each member
shook hands with all of the other members before & after the
meeting.
How many hand shakes were there?
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Answer Posted / rahul
At first time handshake will be 11 and decrease this to 1 that the formula of sum of this sereis is=n(n+1)/2.
that n=11 put in formula
(11*(11+1)/2)=66
66+66=132 bcoz handshake will be two times
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