Mathematics, 22.11.2019 01:31 katerdmab

How many strings of six lowercase letters from the english alphabet contain a)the letter a? b)the letters a and b? c)the letters a and b in consecutive positions with a preceding b, with all the letters distinct? d)the letters a and b, wherea is somewhere to the left of b in the string, with all the letters distinct?

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How many strings of six lowercase letters from the english alphabet contain a)the letter a? b)the l...