i am confused about this one At a family runion everyone shakes everone elses hand once, if a total of 190 handshakes take place,how many people were at the reunion? and one more what is a constant ter in the expansion of (x+2)^9
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IF everybody shook hands atleast once then there were nC2 handshakes since it takes 2 people to shake hands => [n(n-1)]/2=190 n(n-1)=380 or n=20 SO 20 people were present
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