The digit at units place in the product of first ten prime number is
Given:
Find the unit digit of the product of the first ten prime numbers.
Formula Used:
If a product contains both 2 and 5, then it has a factor 10, so the unit digit is 0.
Solution:
First ten prime numbers are:
2, 3, 5, 7, 11, 13, 17, 19, 23, 29
The product clearly includes 2 and 5
Hence, the product is divisible by 10
Unit digit = 0
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