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Question
Find the missing term: 7, 26, 63, 124, 215, 342, ?
Options:
A .  391
B .  421
C .  481
D .  511
Answer: Option D
The terms of the given series are (23 - 1), (33 - 1), (43 - 1 ), (53 - 1), (63 - 1), (73 - 1),..........So, missing term = (83 - 1) = (512 - 1) = 511.

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