The following problem refers to strings in A, B, ..., Z.

label Mathematics
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Jun 21st, 2015

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Jun 21st, 2015

We have 26 choices for each letter. 

So the number of 4 letter strings that begin with S will be:

 26 x 26 x 26 = 17576

Jun 21st, 2015

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Jun 21st, 2015
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Jun 21st, 2015
Oct 24th, 2017
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