Multiple choice

In each of the following number series, the wrong number is given, find out that number. 28, 29, 57, 174, 687, 3436, 20615

  1. 57

  2. 20615

  3. 174

  4. 29

  5. 3436
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The pattern is (previous number × 3) - 3: 28×3-3=81, but we have 57 instead. Checking: 29×3-3=84, 84×3-3=249, not 174. The pattern works if 57 becomes 81. 174 breaks the pattern as 57×3-3=168, not 174.

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