Quoc Tran Anh Le Coordinator
28/02/2019 at 15:13-
Huy Toàn 8A (TL) 01/03/2019 at 03:54We have : primes from 20 to 30 are 23,29
=> total : 23 + 29 = 52
The answer í 52
Quoc Tran Anh Le selected this answer.