Question: Problem 1. Evaluate 3 4 5 + + + 1! + 2! + 3! 2! +3! +4! 3! + 4! + 5! with steps.

Problem 1. Evaluate 3 4 5 + + + 1! + 2! + 3! 2! +3! +4! 3! + 4! + 5! with steps. (Hint: Try to formulate n (n-2)!+(n-1)!+n! ... + 2021 in telescoping form.) 2023 2022! + 2023!
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