SOLUTION: Determine the units' digit of the product of the first 800 prime numbers.

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Question 418991: Determine the units' digit of the product of the first 800 prime numbers.
Answer by richard1234(7193) About Me  (Show Source):
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2 and 5 are among the first 800 prime numbers. Therefore the product is a multiple of 10 and the units digit is 0.