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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?

Answer :

leahcaleb13
the letters a and b becasue those are the first two letters

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