Lemma
MediumPermutations & combinations
AQuA-RAT train #25729 · Combinatorics · Permutations & combinations

How many different arrangements of letters are possible if three letters are…

How many different arrangements of letters are possible if three letters are chosen from the letters A through E and the letters E and A must be among the letters selected?

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AQuA-RAT — Algebra Question Answering with Rationales (Ling et al., DeepMind, 2017) · train #25729

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