**Student:** Joseph T

**Q. I am preparing for IBPS exam for bank job. How to solve this kind of aptitude question?
Find the missing number in below series :
2, 5, 10, __, 26**

**Answer : **

Joesph, Here are the steps and explanation to solve number series questions.

Topic : Number Series

Method : Observe the series and see what pattern is followed.

There can be many patterns like addition, subtraction, squares, cubes, multiples which are simpler one or cobination of one or many of these.

**Series given is : 2, 5, 10, __, 26**

- If we carefully observe, numbers in series are close to squares like :

*1 ^{2} = 1*

*2 ^{2 }= 4*

*3 ^{2 }= 9*

- Observe the number series again
**2, 5, 10, __, 26**and keep in mind the squares example above. - You can find that the series number are 1 more than the squares of integers.
- Like
*1*^{2}+ 1 = 2*2*^{2 }+ 1 = 5*3*^{2 }+ 1 = 10

4^{2 }+ 1 = *17*

^{ }*5 ^{2 }+ 1 = 26*

So missing number in series is *17*

Tips : Squares, Cubes, Multiples shall be on your finger tip to solve this question faster.

Happy Learning

~ Maths Hub Team

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