排列组合 Flipping a fair coin

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排列组合 Flipping a fair coin
Flipping a fair coin.Assume that the coin is flipped 7 times.
What is the probability that both heads and tails occur?
Thank you~

翻转硬币.假设硬币被翻转的7倍,什么是概率,头和尾巴的发生?p=1-（2的7次方分之）-（2的7次方分之1）=126/128=63/64

排列组合 Flipping a fair coin coin a phrase 英译汉Inadvertently flipping through mobile phone,a lot of thin A flip of a coin both sides of a coin put a coin in the hold a job fair pay a fair price a fun fair翻译 a fair weather friend a fair amount 英语翻译When I arrive at a test,I often find students flipping t