a. B and C are three prime numbers within 100, which satisfy a + B = C______ Group

a. B and C are three prime numbers within 100, which satisfy a + B = C______ Group

The formulas are: 2 + 3 = 5; 2 + 5 = 7; 2 + 11 = 13; 2 + 17 = 19; 2 + 29 = 31; 2 + 41 = 43; 2 + 59 = 61; 2 + 71 = 73; there are 8 groups