Discussion
The sum of all prime numbers between 60 and 80 is:
Answer: A
The primes between 60 and 80 are
\[ 61,\ 67,\ 71,\ 73,\ 79 \]
\[ 61 + 67 + 71 + 73 + 79 = 351 \]
63, 65 and 69 are excluded as multiples of 3 or 5, and 77 is \( 7 \times 11 \) - the one most often mistaken for a prime.
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