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Question

563, 647, 479, 815, ?

A
672
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B
386
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C
279
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D
143
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Solution

The correct option is C 143
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.

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