a. Consider the product 1 2 3 ... 1,998 ? 1,999 ? 2,000.

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a. Consider the product 1 · 2 · 3 · ... · 1,998 ? 1,999 ? 2,000. What is the last digit?

b. Consider the product 1 · 2 · 3 · ... · 1,998 · 1,999 · 2,000. What is the last nonzero digit?

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