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

18, 22, 13, 29, 4, ?


1. -32
2. 32
3. 40
4. -40
5. 24

1 Answer

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Best answer
Correct Answer - Option 3 : 40

Considering the above series,

18, 22, 13, 29, 4, ?

The logic of the series can be explained as,

22 – 18 = 4

13 –  22 = –9 

29 – 13 = 16 

4 – 29 = –25 

By observing the pattern, we can write

? – 4 = 62 = 36

⇒ ? = 40

The value of ? is 40

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