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18 May, 12:48

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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Answers (1)
  1. 18 May, 14:16
    0
    The letters a and b becasue those are the first two letters
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