candytrickster3951 candytrickster3951

02-01-2024
Mathematics

contestada

How many strings over the alphabet {a,b,c,d,e} have length 15 and exactly six b's?
a) C(15,6)⋅9^5
b) C(15,6)⋅9^4
c) C(15,6)⋅4^9
d) C(15,6)⋅5^9

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