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Every body in a room shakes hands with everybody else. The total number of hand shakes is 66.

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Every body in a room shakes hands with everybody else. The total number of hand shakes is 66. The total number of persons in the room is

(A) 11 

(B) 12 

(C) 13 

(D) 14

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1 Answer

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Best answer

Answer is (B)

Between any two person there is one hand shake

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