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

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

User Ali Gh
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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
User Ynes
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