In the questions given below, select the one which is different from the other three responses.

Logic: Following patter is: (Number)³ + 1 and common pattern is: (Number)³-1

Now, we check each options.

Option (a): 126 (Follow)

(5)³ + 1 = 125 + 1 = 126​

Option (b): 215 (Not Follow)​

(6)³- 1 = 216 - 1 = 215​

Option (c): 342 (Not Follow)​

(7)³- 1 = 343 - 1 = 342​

Option (d): 511 (Not Follow)​

(8)³- 1 = 512 - 1 = 511

Thus, correct option is (a).