# Number Series Tricks, Questions and Videos

## Alternating Series

In an alternating series, the successive terms increase and decrease alternately. It differs from irregular increase (or decrease) series wherein the successive terms increase (or decrease) continuously but the ratio of increase does not follow a particular trend. While solving an alternate series we should focus on the following possibility of its formation:
1) Whether it is a twin series which has been formed by combining two different series.
2) It has been formed by performing two different kinds of operations alternately on successive terms.

For example: 6, 13, 12, 40, 24, 104, 48, 229, 96…

In the above series, there are two series 6, 12, 24, 48, 96…and 13, 40, 104,229...i.e. the fist one is a geometric series with first term 6 and common ratio 2.
In the second series, terms are having difference 27, 64, 125…. i.e…, 33,45,53

## Odd Man Out (Wrong Number) in a Series

For example:

3, 5, 7, 9, 11…. 9 is the odd man out because all others are prime numbers.
2, 3, 7, 10, 11… Except 10, all are prime numbers.
3, 10, 29, 66, 127, 220, 345….. Except 220, all other terms can be expressed as x3+2, where x = 1, 2, 3…..

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## 3 Responses to “Number Series Tricks, Questions and Videos”

1. Comment made by Sohan on Mar 20th 2019 at 12:32 am: Reply

sohanchopra213@gmail.com

2. Comment made by Showkat Bashir on Dec 11th 2019 at 3:42 pm: Reply

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