Question 192

Which one of the following is the odd one out?

42, 74, 20, 30, 56, 90, 2, 6, 12

Solution

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Let's analyze the pattern:

  • 2 = 1 × 2
  • 6 = 2 × 3
  • 12 = 3 × 4
  • 20 = 4 × 5
  • 30 = 5 × 6
  • 42 = 6 × 7
  • 56 = 7 × 8
  • 74 ≠ 8 × 9
  • 90 = 9 × 10

The pattern here is that each number is the product of two consecutive integers.

However, 74 does not follow the same pattern.

Hence, 74 is the odd one out.

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