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The solution is:
(3 + 1) * 2 = 8
(8 + 1) * 2 = 18
(18 + 1) * 2 = 38
(38 + 1) * 2 = 78
(78 + 1) * 2 = 158 ≠ 168
(158 + 1) * 2 = 318
Therefore, wrong no. is 168
(11)*11 – 1 = 120
11*13 = 143
13*13-1 = 168
13*15 = 195
15*15-1=225
15*17=255
Answer is 255 so, none of these.