Series Completion - Verbal and Reasoning

Directions to SolveIn this type of questions, one term in the number series is wrong. Find out the wrong term.
Q1:

93, 309, 434, 498, 521, 533

A 309

B 434

C 498

D 521

ANS:D - 521

Explanation: The correct pattern is + 63, + 53, + 43, + 33, ..... So, 521 is wrong and must be replaced by (498 + 33) i.e. 525.