$B$ is a group of all strings of length $4$ built using letters $a,b,c,d,e$.
What is $|B|$?
I think the answer is $5^4$, but why we don't need to consider the duplicate letters here?
2026-04-24 17:56:30.1777053390
How many strings of length $4$ can be built from letters $a, b, c, d, e$?
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