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just started learning probability & need some help in understanding....

"The binomial random variable X associated with a binomial experiment consisting of n trials is defined as

X = the number of S's among the n trials.

Suppose, for example, that n = 3. Then there are 8 possible outcomes for the experiment:

SSS SSF SFS SFF FSS FSF FFS FFF"

Why is it that there will be 8 possible outcomes?