Brain Challenge Time! 
The first two lines give you the clue.
2 + 3 = 5
2 × 3 = 6
The results go 5, then 6, so the next one needs to be 7.
To reach 7 with the same numbers, the only simple way is:
2 + 3 + 2 = 7
So the “?” isn’t a normal math sign. It just means add the first number again.
Final answer: 7.
