Lemma
MediumCounting & chance
AQuA-RAT train #16843 · Probability · Counting & chance

Integers a, b, c and d, not necessarily distinct, are chosen independently…

Integers a, b, c and d, not necessarily distinct, are chosen independently and at random from 0 to 2007, inclusive. What is the probability that ad - bc is even?

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AQuA-RAT — Algebra Question Answering with Rationales (Ling et al., DeepMind, 2017) · train #16843

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