13Shouldn't it be- 26C2 - { 13C2 +13} ?
there are 13 couples...
the men can shake hands with everyone except their wives and the women can shake hands with the men only......find the total number of handshakes.....
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4 Answers
4We can explain the ans this way
Selecting a pair for handshake from the 26 people is 26C2
But the women shudn't shake among themselves So subtract 13C2
The men shudn't shake with their wives So subtract 13 (since 13 men r there)
So ans is 26C2 -13 -13C2