SOLUTION: If you multiply all the prime numbers less than 100,000 what is the units' digit of the product?

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Question 519324: If you multiply all the prime numbers less than 100,000 what is the units' digit of the product?
Answer by Edwin McCravy(20056)   (Show Source): You can put this solution on YOUR website!
If you multiply all the prime numbers less than 100,000 what is the units' digit of the product?
2×3×5×7×11×13×17×19×···×99923×99929×99961×99971×99989×99991

Since 2 and 5 are factors of that huge number, so is 10, and every
integer of which 10 is a factor ends in 0.  And the units digit of
any integer is the digit it ends in.  Answer: 0

Edwin
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