Multiple choice

In which of the following questions, one term in the number series is wrong. Find out the wrong term. 5, 10, 40, 80, 320, 550, 2560

  1. 80

  2. 320

  3. 550

  4. 2560
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Series: 5, 10, 40, 80, 320, 550, 2560. Pattern: ×2, ×4, ×2, ×4, ×?, ×4. Following the pattern, 550 should be 320×4 = 1280 (since previous was ×4). But we have 550 which breaks the ×2,×4 alternating pattern. 550 is the wrong term.

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