If n is an integer, f(n) = f(n-1) - n and f(4)=15

If n is an integer, f(n) = f(n-1) - n and f(4)=15. What is the value of f(6)?

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AQuA-RAT — Algebra Question Answering with Rationales (Ling et al., DeepMind, 2017) · train #13276

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