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30-03-2017
Mathematics

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How many strings are there of four lowercase letters that have the letter x in them?

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woahitsbriannas woahitsbriannas

30-03-2017

We can subtract from the number of strings of length 4 of lower case letters the number of string of length 4 of lower case letters other than x. Thus the answer is 264 − 254 = 66,351

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