How many strings of six lowercase letters from the english alphabet contain
a) the letter a?...
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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, where a is somewhere to the left of b in the string, with all the letters distinct?
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