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49 members r there 22 males,17 females,the shake hands between male n female,male n female.total 12 people give shake hans how many such kind of shake hands are possible

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.10 men,10 women dance wid each other find d possibilty that 2 men r dancing with sme women n vice versa after the typist writes 12 letters n addresses 12 envelopes she inset into the envelope (1 letter /envelope).what is the probability thatexactly 1 letter is inserted in an improper envelope