marci30
marci30
10.07.2019 • 
Mathematics

Aword of length 10 is comprised of the following letters (a,a,a,b,b,c,c,d,d,d).
find the number of all such words, in which there are at least two characters of type a sticking together
(i.e. aa a (or) a aa (or) aaa).

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