# Aptitude - Odd Man Out and Series

Exercise : Odd Man Out and Series - Find Wrong 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*

Find out the wrong number in the series.

6.

19, 26, 33, 46, 59, 74, 91

Answer: Option

Explanation:

Go on adding 7, 9, 11, 13, 15, 17 respectively to obtain the next number.

So, 33 is wrong. It must be 35

7.

1, 3, 10, 21, 64, 129, 356, 777

Answer: Option

Explanation:

A x 2 + 1, B x 3 + 1, C x 2 + 1, D x 3 + 1 and so on.

So, 356 is wrong.

8.

6, 12, 48, 100, 384, 768, 3072

Answer: Option

Explanation:

Each even term of the series is obtained by multiplying the previous term by 2.

2^{nd} term = (1^{st} term) x 2 = 6 x 2 = 12

4^{th} term = (3^{rd} term) x 2 = 48 x 2 = 96.

6^{th} term = (5^{th} term) x 2 = 384 x 2 =768.

4^{th} term should be 96 instead of 100.

9.

40960, 10240, 2560, 640, 200, 40, 10

Answer: Option

Explanation:

Go on dividing by 4 to get the next number.

So, 200 is wrong.

10.

3, 7, 15, 39, 63, 127, 255, 511

Answer: Option

Explanation:

Go on multiplying 2 and adding 1 to get the next number.

So, 39 is wrong.

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