Answer :
some people don't consider 1 as a prime so
1,2,3,5,7,11
if you think 1 IS prime
1+2+3+5+7=18
if you think 1 IS NOT prime
2+3+5+7+11=23
it is either 18 or 23
I would consider 1 not prime and go with 23
1,2,3,5,7,11
if you think 1 IS prime
1+2+3+5+7=18
if you think 1 IS NOT prime
2+3+5+7+11=23
it is either 18 or 23
I would consider 1 not prime and go with 23
Answer: 28
Step-by-step explanation: I got the answer correct on a test :) hope this helped you xx