563, 647, 479, 815, (.....)

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RRB TC CC Exam (Bangalore) 2006 click here to view all questions

563, 647, 479, 815, (.....)

A672

B386

C279

D143

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Answer is: 143 The sequense is based on the following pattern  $647 = 563+84$ $479 = 647 - (2 * 84)$ $815 = 479 -(2^2 * 84)$ $? = 815 -(2^3 * 84)$ .'. Missing number = 815 - (8 * 84) = 815 - 672 = 143. Sachin Khr ? answered Nov 18 '2016 at 21:29 All Comments

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