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What will come in place of question mark (?) in the following number series?

28, 34, 46, 66, 96, ?


1. 238
2. 42
3. 138
4. 158
5. None of these

1 Answer

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Correct Answer - Option 3 : 138

Considering the above series,

28, 34, 46, 66, 96, ?

The logic of the series can be explained as,

34 – 28 = 6 = 2 × 3

46 – 34 = 12 = 3 × 4

66 – 46 = 20 = 4 × 5

96 – 66 = 30 = 5 × 6

By observing the pattern,

? – 96 = 6 × 7 = 42

⇒ ? = 42 + 96

⇒ ? = 138

The value of ? is 138

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