If they are fair coins, the probability is 0.25
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The probabilty of you flipping 3 coins and getting all heads or tails is 0.125 or 1/8.
The probability of flipping three tails with three coins is (1 in 2)3 or 1 in 8 or 0.125.
http://wiki.answers.com/Q/If_you_Flip_four_coins_at_once_what_is_probability_of_2_head_and_3_tail" The probability of flipping four coins and getting 2 heads and 3 tails is ZERO 2 heads and 3 tails requires flipping FIVE coins.
It is 1/2.
1 in 2.