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Look at the product of the first 3 prime numbers: 2 x 3 x 5 = 30. Any number multiplied by 30 will have a 0 in the units digit. So, no matter how many prime numbers you are multiplying, if once you have a number ending in 0, all of the rest will end in 0.

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โˆ™ 2010-03-20 05:38:32
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Q: What is the units digit of the product of the first 100 prime numbers?
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