Question 1027607
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how many permutations of size 3 can one produce with the letters p, r, m and n? list them. 
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<U>Answer</U>. {{{C[4]^3 * P(3)}}} = {{{(4*3*2)/(1*2*3)}}} . {{{1*2*3}}} = 4*3*2 = 24.


<U>Solution</U>. There are {{{C[4]^3}}} combinations of 4 things taken 3 at a time, and each of this combinations can be arranged (ordered) by 3! ways.

It gives the answer.
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