Wrong number in the given series is:
7, 28, 63, 124, 215, 342, 511
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → 28
7, 28, 63, 124, 215, 342, 511
THE LOGIC FOLLOWED HERE IS
23 - 1 = 7
33 - 1 = 26 ≠ 28
43 - 1 = 63
53 - 1 = 124
63 - 1 = 215
73 - 1 = 342
83 - 1 = 511