In following question, a number series is given with one term missing. Choose the correct alternative that will same pattern and fill in the blank spaces.
563, 647, 479, 815,

627

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386

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279

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143

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Solution

The correct option is C 143
The pattern is + 84, - 168, + 336,..... i.e. + 84, - (84 * 2), + (84 * $2^{2}$ ),...
$∴$ Missing number = 815 - (84 * $2^{2}$ ) = 815 - 672 = 143.

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