AQuA-RAT train #20876 · Combinatorics · Permutations & combinations
In how many ways can a four-letter password be chosen, using the…
In how many ways can a four-letter password be chosen, using the letters A, B, C, D, and/or E, such that at least one letter is repeated within the password?
AQuA-RAT — Algebra Question Answering with Rationales (Ling et al., DeepMind, 2017) · train #20876
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