Lemma
MediumPermutations & combinations
AQuA-RAT train #17311 · Combinatorics · Permutations & combinations

A first grade teacher uses ten playing cards, each numbered from 1…

A first grade teacher uses ten playing cards, each numbered from 1 to 10, to teach her students to order numbers correctly. She has students choose four flash cards randomly, then arrange the cards in ascending order. One day, she removes the cards '2' and '4' from the deck. On that day, how many different correct arrangements of four randomly selected cards are possible?

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AQuA-RAT — Algebra Question Answering with Rationales (Ling et al., DeepMind, 2017) · train #17311

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