Question: i don't get this Consider strings consisting of 8 lower-case letters. (a) How many total strings are there? (b) How many strings begin with abc?

i don't get this Consider strings consisting of 8 lower-case letters.

i don't get this

Consider strings consisting of 8 lower-case letters. (a) How many total strings are there? (b) How many strings begin with "abc"? (c) How many strings end with "yz"? (d) How many strings begin with "abc" or end with "yz"? (e) How many strings begin with "abc" and end with "yz"? (f) How many strings do not contain the letters "a" or "b

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