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Explanation of controls

To divide x by y, for instance, enter y, click "/", enter x, then click "=".

A few of the button labels might be unfamiliar.
"nCk" is the number of combinations of n things taken k at
a time. To compute it, enter n, click "nCk", enter k, then click "=".
Similarly, "nPk" is the number of permutations of k of n things.
"U[0,1]" returns a pseudorandom number between zero and one.