What is the value of 1 *1

What is the value of 1 *1! +2 *2!+3 *3! + .............. n *n! where n! means n factorial or n(n-1)(n-2) ............1.

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AQuA-RAT — Algebra Question Answering with Rationales (Ling et al., DeepMind, 2017) · train #59132

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