Both heads and tails are equally likely.
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suppose you flipped a coin 100 times you might have flipped heads 50 time and tails 50 times
HeadsTailsTailsTailsHeadsTailsHeads
25%
The probability of landing on heads at least once is 1 - (1/2)100 = 1 - 7.9*10-31 which is extremely close to 1: that is, the event is virtually a certainty.
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