How many two-element subsets of {6,7,8,9} are there that do not contain…

How many two-element subsets of {6,7,8,9} are there that do not contain the pair of elements 8 and 9?

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AQuA-RAT — Algebra Question Answering with Rationales (Ling et al., DeepMind, 2017) · train #6105

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