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5C3 = 10
There are 5C3 = 10 groups.
There are 5C3 = 5*4/(2*1) = 10 combinations
There are 5C3 = (5*4*3)/(2*1) = 30 combinations.
It is 5C3*(1/2)3*(1/2)2 = 10/32 = 5/16