How many two-element subsets of <1, 2,3,4,5,6,7,8,9> are there that do not…

How many two-element subsets of <1, 2,3,4,5,6,7,8,9> are there that do not contain the pair of elements 2 and 4?

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AQuA-RAT — Algebra Question Answering with Rationales (Ling et al., DeepMind, 2017) · train #20154

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