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Seriously? You flip a fair coin, you win if you flip a head. The probability you will flip a tail is 1/2. The probability you will flip two tails in a row is (1/2)(1/2)= 1/4. For any n the probability you will flip n tails in a row is 1/2^n. For large n that will be very small but there is NO n that makes it 0.