Let’s check the logic behind each pair:
- (1) \( 18 \times 17 = 306 \)
- (2) \( 16 \times 17 = 272 \)
- (3) \( 15 \times 17 = 255 \)
- (4) \( 19 \times 17 = 323 \neq 313 \)
So, all follow the pattern:
number × 17, except pair (4):
\[
19 \times 17 = 323 \Rightarrow but given is 313 → odd one out
\]