13-06-2016
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If a coin is flipped 75 times in how many ways could there be exactly two tails

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yelloflash29 yelloflash29

24-06-2016

I think the answer is 2774, it's just a case of adding up all the numbers from 2 to 74. It's like flip 1 and 2, could be the only 2 tails, then 1 and 3, 1 and 4 etc up to 1 and 75, then 2 and 3, 3 and 4 etc.... U get what I mean, anyway I think it's 2774

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