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**Number Series Question-** This is one of the most important topic and can easily fetch you some very good score. Make sure that you practice this topic well as it can be a game changer. Number series questions are asked in both IBPS RRB PO as well as in IBPS RRB Clerk and carries a reasonable marks i.e 5-7 at time you can also find as many as 10 questions in both the exams for 10 marks which is alot in a competition like IBPS RRB PO and IBPS RRB Clerk. **In this space, we will discussing how you can ace this topic and will also provide you a free PDF to practice with.**

## Number Series Question

**There are different types of Number Series as given below:**

**Square series-** This series basically consists of squares of a certain numbers and you have to find the next number in the progression i.e 4, 9, 16, 25…

**Cube Series-** These series has cubes of certain numbers and you have to find the next numbers 27, 64, 729, ….

**Two Stage Series**– This series consist of two simultaneous series which need to be solved. 2, 3, 4, 6, 8, 9, ….

There are other types of series as well that one must practice and given below are some of the tips to Solve Number Series Question

Learn the basics first like tables, Squares, Cubes, Fractional value etc.

Always start solving Number series f**rom the largest number to the smallest Number** because the possibilities are less in that case.

Do not waste more than **20 seconds** on a number series question.

## Number Series Questions: Example

**Let’s Understand this topic better with Example:**

**Directions (1-10) :** In each of these questions a number series is given. In each series only one number series is given. In each series only one number is wrong. Find out the wrong number.

**Q1. 1 3 10 36 152 760 4632**

(a) 3

(b) 36

(c) 4632

(d) 760

(e) 152

S1. Ans.(d)

Sol. The number should be 770 in place of 760 because X1+2, x2+2, x3+3 and so on

**Q2. 12, 12, 18, 45, 180, 1170, ?**

(a) 12285

(b) 10530

(c) 11700

(d) 12870

(e) 9945

S2. Ans.(a)

Sol. The pattern is ×1.0, ×1.5, ×(1 + 1.5), ×(1.5 + 2.5), ×(2.5 + 4), ×(4 + 6.5)

∴ ? = 10.5 × 1170

? = 12285

**Q3. 67, 1091, 835, 899, 883, ?**

(a) 889

(b) 887

(c) 883

(d) 894

(e) 896

S3. Ans(b)

Sol. Pattern of series – 67 + 4^{5} = 1091

1091 – 4^{4 }= 835

835 + 4^{3} = 899

899 – 4^{2} = 883

? = 883 + 4^{1} = 887

Q. In each of the following questions a number series is given. After the series a number is given followed by (a), (b), (c), (d) and (e). You have to complete the series starting with the number given, following the sequence of the original series and answer the questions that follow the series.

**Q6. 12, 30, 120, 460, 1368, 2730**

**16 (a) (b) (c) (d) (e)**

**What will come in place of (d) ?**

(a) 1384

(b) 2642

(c) 2808

(d) 1988

(e) None of these

S6. Ans. (c)

Sol. The given series is based on the following pattern:

30 = 12 × 6 – 7 × 6

120 = 30 × 5 – 6 × 5

460 = 120 × 4 – 5 × 4

1368 = 460 × 3 – 4 × 3

2730 = 1368 × 2 – 3 × 2

Similarly,

(a) = 16 × 6 – 7 × 6 = 96 – 42 = 54

(b) = 54 × 5 – 6 × 5 = 240

(c) = 240 × 4 – 5 × 4 = 940

(d) = 940 × 3 – 4 × 3 = 2808

Hence, 2808 will come in place of (d).

We hope that you have understood the concept well, you can practice what you have learned from the Free PDF given below:

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