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There are 16 permutations of a coin tossed 4 times. They are ...

HHHH - HHHT - HHTH - HHTT

HTHH - HTHT - HTTH - HTTT

THHH - THHT - THTH - THTT

TTHH - TTHT - TTTH - TTTT

... and the permutations with only one tail are bolded. There are 4, so the probability of flipping a coin 4 times and getting only 1 tail is 4 in 16, or 1 in 4, or 0.25.

The coin does not have a memory therefore the probability is always 50/50.

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13y ago

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