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In each of the following number series, the wrong number is given, find out that number.

6, 4, 5, 8.5, 18, 55, 139


1. 4
2. 5
3. 8.5
4. 55
5. 18

1 Answer

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Best answer
Correct Answer - Option 4 : 55

Calculation

The series follows the following pattern

⇒ (6 × 0.5) + 1 = 4

⇒ (4 × 1) + 1 = 5

⇒ (5 × 1.5) + 1 = 8.5

⇒ (8.5 × 2) + 1 = 18

⇒ (18 × 2.5) + 1 = 46

⇒ (46 × 3) + 1 = 139

∴ The wrong term in the series is 55.

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