This means the chances of this happening are close to, if not, 100%.
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If a number has a probability of 1 it means it is certain to occur.
An event with a probability of 001 = 1 is a certainty. The event must happen.
1 means the event is certain to occur.
The probability is 1.The probability is 1.The probability is 1.The probability is 1.
If you mean 1: head 2:tail 3:head the probability is 1/2 x 1/2 x 1/2 = 1/8. If you mean only that you want the heads and tails to alternate, that is, you mean the above or tail, head , tail, the probability is 1/8 + 1/8 = 1/4.