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- Question 1 of 24
##### 1. Question

What is the next number in this sequence ?

1, 3, 8, 19, 42, 89, ..?..

##### Hint

Each of the numbers is doubled and 1, 2, 3, 4, 5, 6 is added in next term,

so, 89 × 2 + 6 = 184. - Question 2 of 24
##### 2. Question

Which is the number that comes next in this sequence?

5, 16, 51, 158, ..?..

##### Hint

16 = 5 × 3 + 1, 51 = 16 × 3 + 3, 158 = 51 × 3 + 5

∴ Next term = 158 × 3 + 7 = 481 - Question 3 of 24
##### 3. Question

Which one of the numbers will complete the series ?

8, 13, 10, 15, 12, 17, 14 ..?..

##### Hint

Second term is greater than first term by 5, while the third term is less than the second term by 3. The same order is repeated.

- Question 4 of 24
##### 4. Question

Which one of the numbers will complete the series ?

6.25, 9, 12.25, 16, 20.25, 25, 30.25, ..?..

##### Hint

There are two alternate series

Series I: 6.25, 12.25, 20.25, 30.25 (sequence is +6, +8, +10)

Series II: 9, 16, 25, 36, (sequence is +7, +9, +11)

- Question 5 of 24
##### 5. Question

What number will come next in the following series?

2, 2, 4, 4, 6, 8, 8, ..?..

##### Hint

The given series consists of 2 series

(i) 2, 4, 6, 8 ………….

(ii) 2, 4, 8 ………….

Series (i) → 2× 1, 2 × 2, 2 × 3 , 2 × 4 …….

Series (ii) → 2, 2× 2, 4 × 2, 8 × 2 = 16 ……. - Question 6 of 24
##### 6. Question

What number will come next in the following series?

2, 12, 36, 80, 150, ..?..

##### Hint

1³ + 1² = 2, 2³ + 2² = 12, 3³ + 3² = 36 and so on

∴ 6³ + 6² = 252 - Question 7 of 24
##### 7. Question

Which number will come next in the following set of numbers

3, 13, 53, 213 ..?..

##### Hint

The difference in consecutive numbers follows the sequence, 10, 40, 160.

So the next difference = 160 × 4 = 640

Therefore number = 213 + 640 = 853. - Question 8 of 24
##### 8. Question

Which number will come next in the following set of numbers?

2, 5, 7, 12, 15, 17, 22 ..?..

##### Hint

2+3 = 5, 5+2 = 7, 7+5 = 12, 12+3 = 15, 15+2 = 17, 17+5 = 22.

Note that 3,2,5 are being added that order to various numbers to get the next number. Therefore, 3 should be added to 22 to get the answer. - Question 9 of 24
##### 9. Question

Which number will come next in the following series

8,15,28,53, ..?..

##### Hint

8 × 2 – 1 = 15,

15 × 2 – 2 = 28,

28 × 2 – 3 = 53,

53 × 2 – 4 =102 - Question 10 of 24
##### 10. Question

Which number will come next in the following series

3, 12, 27, 48, 75, 108, ..?..

##### Hint

The numbers are 3 × 1², 3 × 2², 3 × 3², 3 × 4², 3 × 5², 3 × 6², ……

∴ Missing number = 3 × 7² = 3 × 49 = 147 - Question 11 of 24
##### 11. Question

Which numbers will come next in the following series?

1, 8, 9, 64, 25, 216, ..?.., ..?..

##### Hint

The odd terms are squares of the numbers 1, 3, 5, …. while the even terms are cubes of the numbers 2,4,6,….

- Question 12 of 24
##### 12. Question

Which number will fit in the following series

3, 15, 4, 16, 5, 17, 6, ..?.., 7

##### Hint

There are two alternate series.

1st series : 3, 4, 5, 6, 7 …….. and so on.

2nd series : 15, 16, 17,18, 19 ……. and so on. - Question 13 of 24
##### 13. Question

Find the missing term in the following series.

240, ..?.. 120, 40, 10, 2

##### Hint

Ratios of two consecutive terms are

1, ½, ⅓, ¼, and ⅕ respectively. - Question 14 of 24
##### 14. Question

Which number will fit in the following series?

0, 7, 26, ..?.., 124, 215

##### Hint

Clearly the given series is 1³ – 1, 2³ – 1, 3³ – 1, 4³ – 1, 5³ – 1, 6³ – 1.

So, the missing number is 4³ – 1 = 63. - Question 15 of 24
##### 15. Question

Which number will fit in the following series?

4, 16, 36, ..?.., 100, 144

##### Hint

The numbers in the series are square of 2,4,6 …,10,12 .

Therefore, the missing number is square of 8 i.e. 8² = 64. - Question 16 of 24
##### 16. Question

Find the missing number in the series :

6, 12, 21, ..?.., 48

##### Hint

The common differences between the consecutive terms of the series are 6, 9, 12, 15, etc.

- Question 17 of 24
##### 17. Question

Which one number does not belong to the series ?

3, 5, 8, 11, 17, 23

##### Hint

Differences between two consecutive terms are 2, 3, 4, 5 and 6 respectively.

- Question 18 of 24
##### 18. Question

Which one number does not belong to the series ?

905, 180, 175, 35, 30, 6, 1

##### Hint

The sequence followed in the series is ÷5, –5 which is repeated.

∴ 900 should be in place of 905. - Question 19 of 24
##### 19. Question

Which one of the numbers is wrong in the series given below ?

3, 2, 8, 9, 13, 22, 18, 32, 23, 42

##### Hint

There are 2 series :

3, 8, 13, 18, 23 and 2, 12, 22, 32, 42. Hence 9 is wrong. - Question 20 of 24
##### 20. Question

Which one of the numbers is wrong in the series given below?

12, 18, 27, 90, 270, 945, 3780

##### Hint

If 27 is replaced by 36, then the ratios of two consecutive terms are 3/2, 2, 5/2, 3, …

- Question 21 of 24
##### 21. Question

Find the wrong number in the series :

7, 28, 63, 124, 215, 342, 511

##### Hint

The series is

2³ – 1, 3³ – 1, 4³ – 1, 5³ – 1, 6³ – 1, 7³ – 1, 8³ – 1 - Question 22 of 24
##### 22. Question

Which one number does not belong to the series ?

11, 2, 21, 3, 32, 4, 41, 5, 51, 6

##### Hint

The given sequence is a combination of two series:

I. 11, 21, 32, 41, 51 and II. 2, 3, 4, 5, 6

Clearly, the pattern in I is +10

So, 32 is wrong and should be replaced by (21 + 10) i.e. 31. - Question 23 of 24
##### 23. Question

Which one of the numbers is wrong in the series given below ?

89, 78, 86, 80, 85, 82, 83

##### Hint

The sequence is –11, +9, –7, +5, –3, +1

So, 86 is wrong and should be replaced by (78 + 9) i.e. 87. - Question 24 of 24
##### 24. Question

Which one of the numbers is wrong in the series given below ?

5, 10, 17, 24, 37

##### Hint

The sequence is +5, +7, …… .

So, 24 is wrong and should be replaced by (17 + 9) i.e. 26.