Discussion
The sum of all prime numbers from 1 to 20 is:
Answer: B
The primes from 1 to 20 are
\[ 2,\ 3,\ 5,\ 7,\ 11,\ 13,\ 17,\ 19 \]
\[ 2+3+5+7+11+13+17+19 = 77 \]
1 is not prime, having only one divisor rather than two.
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