For two sets $A = \{ a + 2,6 \} , B = \{ 3 , b - 1 \}$, when $A = B$, what is the value of $a + b$? (Note: $a , b$ are real numbers.) [2 points] (1) 5 (2) 6 (3) 7 (4) 8 (5) 9
For two sets $A = \{ a + 2,6 \} , B = \{ 3 , b - 1 \}$, when $A = B$, what is the value of $a + b$? (Note: $a , b$ are real numbers.) [2 points]\\
(1) 5\\
(2) 6\\
(3) 7\\
(4) 8\\
(5) 9