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wthu
answered 2021-06-11 16:26:13

25 times

this is because there is a 1/2 chance of there being one head and one tail, and only 1/4 each of there being two heads or two tails:

coin 1: h (1/2 chance) x coin 2: h (1/2 chance) = 1/4 chance

coin 1: t (1/2 chance) x coin 2: h (1/2 chance) = 1/4 chance

coin 1: h (1/2 chance) x coin 2: t (1/2 chance) = 1/4 chance

coin 1: t (1/2 chance) x coin 2: t (1/2 chance) = 1/4 chance

coin 1 being heads and coin 2 being tails is the same vice versa, so:

50 tosses x (1/4 + 1/4) = 25 times

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