S = {HHH, HHT, HTH, THH, HTT, THT, TTH, TTT}
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If you toss eight coins, there are 256 (28) different outcomes.
If you toss them enough times, the probability is 1. For just one toss the probability is 1/4.
It is 0.00540 approx.
you toss 3 coins what is the probability that you get exactly 2 heads given that you get at least one head?
It is used for lots of things such as finding out the total possible outcomes of tossing coins. You find the line that corresponds with how many coins you toss and add all the numbers in that line to get the number of possible outcomes also you can use it to find combinations and permutations and triangular numbers