Number series is the most important chapter of reasoning.

Number series is easy to learn - You will enjoy it.

Following are the different type of Number series.

- Prime Series
- Difference Series
- Product Series
- Binary Series
- Combination Series
- Miscellaneous Series

Before going to the example of prime series you must have knowledge about the prime number.

A prime number is a number greater than 1, whose only have two factors that are 1 and itself. Some Prime numbers example are 2, 3, 5, 7, 11, 13, 17, 19, 23, and 29.

```
1. 7,11,13,17,19,______
```

A)21

B)23

C)24

D)27

**Answer:**B)23

**Explanation:**

Here the numbers are consecutive primes. So, the next number is 23.

```
2. 4,6,9,14,21,______
```

A)32

B)24

c)26

D)23

**Answer** A) 32

Here the difference between the number is consecutive primes i.e 2,3,5 and so on.

the required term is" 21+11=32

```
3. 169,121,49,25,______
```

A)3

B)8

C)9

D)18

**Answer**: C)9

Here the numbers are squares of consecutive primes i.e. 13^{2},11^{2},7^{2},5^{2}___

the required term is 3^{2}=9

```
4. 8,27,125,343,______
```

A)512

B)729

C)1000

D)1331

**Answer**: D)1331

Here the numbers are cubes of consecutive primes i.e 2^{3},3^{3},5^{3},7^{3},___

the required term is 11^{3}=1331

```
5. 5,6,10,19,35,______
```

A)55

B)60

C)65

D)50

**Answer**: B)60

Here the difference between 5 and 6 is 1 i.e. 1^{2}

between 6 and 10 is 4 i.e. 2^{2}
So last one becomes 5^{2} So the final answer is 35+5^{2}=60