What is the sum of all the prime numbers between 1 to 20?

There are eight prime numbers between 1 to 20 i.e. 2, 3, 5, 7, 11, 13, 17, and 19.

So, the sum of all the prime numbers between 1 to 20 = 2 + 3 + 5 + 7 + 11 + 13  + 17 + 19 = 77

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