ANSWERS: 3
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(.5)^7 ... presuming you are using a normal coin that only is "heads" on one side.
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The same probability it would be having it land tails 7 times or heads/tails/heads etc. And that is all I remember from math. Oh and your mom!
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100% if you're dealing with a 2 headed coin, or 0% with a 2 tailed coin.
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