Solution
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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