1.

Which number would replace underline mark in the series?

2, 5, 10, 17, ---, 37

**Answer: Option 'C'**

**Here the difference between the consecutive terms is increase by 2
5 - 2 = 3,
10 - 5 = 5,
17 - 10 = 7,
then 17 + 9 = 26.**

2.

U_VU_WV__WV_

**Answer: Option 'A'**

**WUUUU**

3.

Which number would replace underline mark in the series?

1, 6, 26,_____, 426.

**Answer: Option 'C'**

**Here the difference between the consecutive terms is multiplied by 4.
The difference of the two consecutive numbers is 5, 20, .....
5 × 4 = 20
20 × 4 = 80
26 + 80 = 106.**

4.

Look at this series: 14, 28, 20, 40, 32, 64, . . .

What number should come next ?

**Answer: Option 'B'**

**This is an alternating multiplication and subtracting series: First, multiply by 2 and then subtract 8.
Rule = (1st no.) (1st x 2 = 2nd no.) (2nd - 8 = 3rd no.) (3rd x 2 = 4th no.)....
Now (14) (14 x 2 = 28) (28 - 8 = 20) (20 x 2 = 40) (40 - 8 = 32) (32 x 2 = 64) (64 - 8 = 56)...
So the answer is b = 56.**

5.

Find the wrong number in the series.

1, 2, 6, 15, 31, 56, 91

**Answer: Option 'D'**

**The difference odd the two consecutive numbers are
1, 4, 9, 16, 25, 35.
+1**

6.

Find the missing number in the following series.

512, 256, 64, 32, ?

**Answer: Option 'C'**

**512/2 = 256
256/4 = 64
64/2 = 32
32/4 = 8.**

7.

Find the wrong number in the series.

2, 5, 10, 17, 26, 37, 50, 64

**Answer: Option 'C'**

**1 ^{2} + 1, 2^{2} + 1, 3^{2} + 1 ..........8^{2} + 1 = 65 **

But 64 has been given here. So our wrong number is 64

8.

Look at the series 3, 3/2, 3/4, 3/6 … what number should come next?

**Answer: Option 'A'**

**3/8**

9.

2, 10, 26, 50, ___, 122.

**Answer: Option 'A'**

**Here the series of the form (1 ^{2} + 1), (3^{2} + 1), (5^{2} + 1), .......**

10.

Look at this series: 3, 4, 7, 8, 11, 12, . . .

What number should come next ?

**Answer: Option 'C'**

**This alternating addition series begins with 3;
then 1 is added to give 4;
then 3 is added to give 7;
then 1 is added, and so on.
Rule = (first number + 1) (second number + 3) (third number + 1) (fourth number + 3)...
Now The series is 3, 4, 7, 8, 11, 12...
(3 + 1 = 4), (4 + 3 = 7), (7 + 1 = 8), (8 + 3 = 11), (11 + 1 = 12) (12 + 3 = 15)...
So the answer is d = 15.**

11.

Find the missing number in the following series.

1050, 506, 236, 105, ?

**Answer: Option 'D'**

**1050/2 = 525 - 19 = 506
506/2 = 253 - 17 = 236
236/2 = 118 - 13 = 105
105/2 = 52.5 - 11 = 41.5**

12.

Find the wrong number in the following series

6,15,30,75,151,375,750

**Answer: Option 'A'**

**151**

13.

Find the missing number in the following series.

376, 188, 47, 23.5, ?

**Answer: Option 'C'**

**367/2 = 188
188/4 = 47
47/2 = 23.5
23.5/4 = 5.8**

14.

What will be the next term in?

G, T, I, R, K, P, ___,___

**Answer: Option 'A'**

**M,N**

15.

Look at the series 48, 48, 34, 34, 20, 20…. What number should come next?

**Answer: Option 'B'**

**6**

16.

Find the missing number in the following series.

2, 3, 6, 15, 45, ?

**Answer: Option 'D'**

**2 × 1.5 = 3
3 × 2 = 6
6 × 2.5 = 15
15 × 3 = 45
45 × 3.5 = 157.5**

17.

2, 10, 40, 120,____

**Answer: Option 'A'**

**Here the series is a multiplication series.
The order of the multiplication is ×5, ×4, ×3, ×2
120 × 2 = 240**

18.

What will be the next term in?

REU, QGV, PIW, QKX, -----

**Answer: Option 'D'**

**NMY**

19.

3 13 18 23 28 33

What number should come next?

**Answer: Option 'A'**

**In this simple addition series, each number is 5 greater than the previous number.
Rule = (1st no) (1st no + 5 = 2nd no) (2nd no + 5 = 3rd no) . . .
Now (3) (3 + 5 = 8) (8 + 5 = 13) (13 + 5 = 18) (18 + 5 = 23) (23 + 5 = 28) (28 + 5 = 33) (33 + 5 = 38) (38 + 5 = 43)
So the answer is c = 38 43**

20.

_CAM_AMC_M_A_CAM

**Answer: Option 'D'**

**MCACM**

21.

Find the missing number in the following series.

12, 53, 207, 618, ?

**Answer: Option 'C'**

**12 × 5 - 7 = 53
53 × 4 - 5 = 207
207 × 3 - 3 = 618
618 × 2 - 2 = 1234.**

22.

1, 2, 3, 10, ____, 9802

**Answer: Option 'C'**

**1 ^{2} + 1 = 2
2^{2} - 1 = 3
3^{2} + 1 = 10
10^{2} - 1 = 99.**

23.

Look at this series: 5.2, 4.8, 4.4, 4, . . .

What number should come next?

**Answer: Option 'B'**

**In this simple subtraction series, each number decreases by 0.4.
Rule = (1st no.) (1st no. - 0.4 = 2nd no.) (2nd no. - 0.4 = 3rd number)...
Now (5.2) (5.2 - 0.4 = 4.8) (4.8 - 0.4 = 4.4) (4.4 - 0.4 = 4) (4 - 0.4 = 3.6) ...
So the answer is d = 3.6**

24.

Look at the series 3.8, 3.5, 3.2, 2.9…… What number should come next?

**Answer: Option 'B'**

**2.6**

25.

Which number would replace underline mark in the series?

1, 20, 58, ____, 191.

**Answer: Option 'B'**

**Here the difference between the two consecutive terms is 19, 38, 57, 76
58 + 57 = 115**

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