Identify the method that must be used to find the numbers of strings of four low

Question

Identify the method that must be used to find the numbers of strings of four lowercase letters that have the letter x in term. Add the number of strings of length 4 of lower case letters and the numbers of strings of length 4 lower case letters other than x. Subtract from the number of strings of length 4 lower case letters the number of strings of length 4 of lower case letters that have x. Add from the number of strings of length 4 of lower case letters the numbers of strings of length 4 lower case letters that have x. Subtract from the strings of length 4 lower case letters the number of strings of length 4 of lower case letters other than x.

Explanation / Answer

Method used-

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 our answer for the number of strings is 264 254 = 66,351

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