Lemma
MediumPermutations & combinations
AQuA-RAT train #5099 · Combinatorics · Permutations & combinations

A military commander has to choose 2 soldiers out of a company…

A military commander has to choose 2 soldiers out of a company of 9 for guarding the headquarters. How many different group combinations of 2 does he have to choose from?

This problem repeats another one in the library (at most with different numbers), so it's left out of browsing.

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AQuA-RAT — Algebra Question Answering with Rationales (Ling et al., DeepMind, 2017) · train #5099

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