The sum of all prime numbers less than 20 is:
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → 77
A prime number has only two factors, 1 and itself. So 1 is not a prime, and 2 is the only even prime.
Primes less than 20: 2, 3, 5, 7, 11, 13, 17, 19
Sum \(=2+3+5+7+11+13+17+19=77\)