# Aptitude - Odd Man Out and Series

Exercise : Odd Man Out and Series - Missing No.

- Odd Man Out and Series - Odd Man Out
- Odd Man Out and Series - Pick Wrong No.
- Odd Man Out and Series - Missing No.
- Odd Man Out and Series - Find Wrong No.

*Directions to Solve*

Insert the missing number.

1.

16, 33, 65, 131, 261, (....)

Answer: Option

Explanation:

Each number is twice the preceding one with 1 added or subtracted alternatively.

So, the next number is (2 x 261 + 1) = 523.

2.

10, 5, 13, 10, 16, 20, 19, (....)

Answer: Option

Explanation:

There are two series (10, 13, 16, 19) and (5, 10, 20, 40), one increasing by 3 and the other multiplied by 2.

3.

1, 4, 9, 16, 25, 36, 49, (....)

Answer: Option

Explanation:

Numbers are 1^{2}, 2^{2}, 3^{2}, 4^{2}, 5^{2}, 6^{2}, 7^{2}.

So, the next number is 8^{2} = 64.

4.

2, 4, 12, 48, 240, (....)

Answer: Option

Explanation:

Go on multiplying the given numbers by 2, 3, 4, 5, 6.

So, the correct next number is 1440.

5.

8, 7, 11, 12, 14, 17, 17, 22, (....)

Answer: Option

Explanation:

There are two series (8, 11, 14, 17, 20) and (7, 12, 17, 22) increasing by 3 and 5 respectively.

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