Rework problem 17 from section 1.4 of your text, involving a product code. Assume that product codes are formed from the letters W, X, and Q, and consist of 5 not necessarily distinct letters arranged one after the other. For example, WWQWW is a product code.
How many different product codes contain exactly one W
I tried solving it like this:
I assumed that there are only 5 combinations in which that letter can be arranged.
Just like so:
Having done so, the only thing that is left is to count the rest of permutations. I don't know what to do next.
Rework problem 17 from section 1.4 of your text, involving a product code.
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