self Maths Puzzle

If six coins are flipped simultaneously, the probability of getting at least one pair is closest to:

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self Other Question

i just want to knw ...hw to get placement in wipro...m clearly telling u guys i m not selected in TCS ..m very disappointed....m very frustrated ...m not getting nething..plz guide me frndz..hw sud i prepare for wipro campus drive !! how many factors are there in 16!.