One term in the number series is wrong. Find out the wrong term. 93, 309, 434, 4

Question

One term in the number series is wrong. Find out the wrong term.
93, 309, 434, 498, 521, 533

Options:

A . 309

B . 434

C . 498

D . 521

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

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