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The probability is (4/52) * (4/52) = 1/169 = 0.0059, approx.
There are two one-eye jacks in a standard deck of 52 cards. So the probability of getting one is 2/52 = 1/26
The probability of getting at least 1 tails is (1 - probability of getting all heads) The probability of getting all heads (no tails) is ½ x ½ x ½ x ½ x ½ x ½ x ½ x ½ = 1/256 = 0.00390625 so the probability of getting at least ONE tails is 1-0.30390625 = 0.99609375 = 255/256
It is approx 0.1445
It is 0.375