Multiple choice

A series is given with one/two-term missing. Choose the correct alternative from the given ones that will complete the series. $563 , 647 , 479 , 815 ?$

  1. $672$
  2. $368$
  3. $279$
  4. $143$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The series follows a pattern: add 84, then subtract 168, then add 336. Each operation doubles the previous one (84×2=168, 168×2=336), alternating between addition and subtraction. 563+84=647, 647-168=479, 479+336=815. Following the pattern, the next operation is subtract 672 (336×2), giving 815-672=143. Option D is correct.

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