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Series Completion - Verbal and Reasoning

Directions to SolveChoose the correct alternative that will continue the same pattern and replace the question mark in the given series.
Q1:

563, 647, 479, 815, ?

A 672

B 386

C 279

D 143

ANS:D - 143

Explanation: The pattern is + 84, - 168, + 336,.....i.e. + 84, - (84 x 2), + (84 x 22), ..... So, missing term = 815 - (84 x 23) = 815 - 672 = 143.