1. 2, 10, 26, 50, ___, 122.
A. 82
B. 90
C . 80
D . 62
Answer: Option A
Explanation:
Here the series of the form ([latex]{1}^{2}[/latex] + 1), ([latex]{2}^{2}[/latex] + 1), [latex]{2}^{2}[/latex] + 1), .......
2. Look at this series: 14, 28, 20, 40, 32, 64, . . .
What number should come next?
A. 52
B. 56
C . 86
D . 98
Answer: Option B
Explanation:
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.
3. Look at this series: 5.2, 4.8, 4.4, 4, . . .
What number should come next?
A. 3
B. 3.6
C . 3.5
D . 3.3
Answer: Option B
Explanation:
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
4. 84 78 72 66 60 54 48
What number should come next?
A. 44 34
B. 42 36
C . 42 32
D . 40 34
Answer: Option B
Explanation:
In this simple subtraction series, each number is 6 less than the previous number.
Rule = (1st number) (1st no - 6 = 2nd no.) (2nd no - 6 = 3rd no). . .
Now (84) (84 - 6 = 78) (78 - 6 = 72) (72 - 6 = 66) (66 - 6 = 60) (60 - 6 = 54) (54 - 6 = 48) (48 - 6 = 42) (42 - 6 = 36).
So the answer is b = 42 36
5. Look at this series: 3, 4, 7, 8, 11, 12, . . .
What number should come next?
Answer: Option C
Explanation:
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.
6. Look at this series: 31, 29, 24, 22, 17, . . .
What number should come next?
A. 15
B. 14
C . 13
D . 12
Answer: Option A
Explanation:
This is a simple alternating subtraction series, which subtracts 2, then 5.
Rule = (first number - 2) (second number - 5) (third number - 2) (fourth number - 5)...
Now The series is 31, 29, 24, 22, 17, . . .
(31 - 2 = 29), (29 - 5 = 24), (24 - 2 = 22), (22 - 5 = 17), (17 - 2 = 15)...
So the answer is a = 15.
7. Find the wrong number in the series.
1, 2, 6, 15, 31, 56, 91
A. 31
B. 71
C . 81
D . 91
Answer: Option D
Explanation:
The difference odd the two consecutive numbers are
1, 4, 9, 16, 25, 35.
+[latex]{1}^{2}[/latex] , +[latex]{2}^{2}[/latex], +[latex]{3}^{2}[/latex],+[latex]{4}^{2}[/latex],+[latex]{5}^{2}[/latex],+[latex]{6}^{2}[/latex]
Here 35 is is wrong. wrong answer 91
8. Find the wrong number in the series.
2, 5, 10, 17, 26, 37, 50, 64
Answer: Option C
Explanation:
[latex]{1}^{2}[/latex] + 1 , [latex]{2}^{2}[/latex] + 1, [latex]{3}^{2}[/latex] + 1 .........[latex]{8}^{2}[/latex] + 1 = 65
But 64 has been given here. So our wrong number is 64
9. Find the missing number in the following series.
512, 256, 64, 32, ?
Answer: Option C
Explanation:
[latex]\frac{512}{2}[/latex] = 256
[latex]\frac{256}{4}[/latex] = 64
[latex]\frac{64}{2}[/latex] = 32
[latex]\frac{32}{4}[/latex]= 8.
10. Find the missing number in the following series.
2, 3, 6, 15, 45, ?
A. 95
B. 105.5
C . 147
D . 157.5
Answer: Option D
Explanation:
2 × 1.5 = 3
3 × 2 = 6
6 × 2.5 = 15
15 × 3 = 45
45 × 3.5 = 157.5