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What should come in place of the question mark '?' in the following number series?

18, 10, 12, 28, 120, ?


1. 986
2. 452
3. 956
4. 555
5. 976

1 Answer

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Best answer
Correct Answer - Option 5 : 976

Calculation:

Considering the above series,

18, 10, 12, 28, 120, ?

The logic of the series can be explained as:

18 × 0.5 + 1 = 10

10 × 1 + 2 = 12

12 × 2 + 4 = 28

28 × 4 + 8 = 120

By observing the pattern, we can write

⇒ 120 × 8 + 16 = ?

⇒ ? = 976

∴ The value of ? is 976.

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