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Directions to solve:
In each series, look
for the degree and direction of change between the numbers. In other words,
do the numbers increase or decrease, and by how much
1. Look at this series: 7, 10, 8, 11, 9, 12, ...
What number should come next?
A. 7 B. 10
C. 12 D. 13
Answer: Option B
Explanation: This is a simple alternating
addition and subtraction series. In the first pattern, 3 is added; in the
second, 2 is subtracted.
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2. In following question, a
number series is given with one term missing. Choose the correct alternative
that will same pattern and fill in the blank spaces.
2, 3, 5, 7, 11, x, 17
A. 12 B. 13
C. 14 D. 15
Answer: B
Explanation: Clearly, the
given series consists of prime numbers starting from 2. The prime number after
11 is 13.
So, 13 is the missing number
3. In following question, a
number series is given with one term missing. Choose the correct alternative
that will same pattern and fill in the blank spaces.
6, 11, 21, 36, 56,?
A. 42 B.
51
C. 81 D.
91
Answer: C
Explanation: The pattern is +
5, + 10, + 15, + 20,....
.'. Missing Number = 56 + 25
= 81.
4. Look at this series: 36,
34, 30, 28, 24, ... What number should come next?
A. 20 B. 22
C. 23 D. 26
Answer: Option B
Explanation: This is an
alternating number subtraction series. First, 2 is subtracted, then 4, then 2,
and so on.
5. Look at this series: 22,
21, 23, 22, 24, 23, ... What number should come next?
A. 22 B. 24
C. 25 D. 26
Answer: Option C
Explanation: In this simple
alternating subtraction and addition series; 1 is subtracted, then 2 is added,
and so on.
6. Look at this series: 53,
53, 40, 40, 27, 27, ... What number should come next?
A. 12 B. 14
C. 27 D. 53
Answer: Option B
Explanation: In this series,
each number is repeated, then 13 is subtracted to arrive at the next number.
7. In following question, a
number series is given with one term missing. Choose the correct alternative
that will same pattern and fill in the blank spaces.
3, 9, 27, 81,?
A. 324 B. 243
C. 210 D. 162
Answer: B
Explanation: Each term of the
given series is obtained by multiplying its preceding term by 3.
.'. Missing number = 81 * 3 = 243.
8. In following question, a
number series is given with one term missing. Choose the correct alternative
that will same pattern and fill in the blank spaces.
1, 9, 17, 33, 49, 73,
A. 97 B. 98
C. 99 D. 100
Answer: A
Explanation: The pattern is + 8, + 8, + 16, + 24,....
.'. Missing number = 73 + 24
= 97
9. In following question, a
number series is given with one term missing. Choose the correct alternative
that will same pattern and fill in the blank spaces.
2, 5, 9, , 20, 27
A. 14 B. 16
C. 18 D. 24
Answer: A
Explanation: The pattern is +
3, + 4,....
.'. Missing number = 9 + 5 =
14.
10. Look at this series: 21,
9, 21, 11, 21, 13, 21, ... What number should come next?
A. 14 B. 15
C. 21 D. 23
Answer: Option B
Explanation: In this
alternating repetition series, the random number 21 is interpolated every other
number into an otherwise simple addition series that increases by 2, beginning
with the number 9.
11. Look at this series: 58,
52, 46, 40, 34, ... What number should come next?
A. 26 B. 28
C. 30 D. 32
Answer: Option B
Explanation: This is a simple
subtraction series. Each number is 6 less than the previous number.
12. Look at this series: 3,
4, 7, 8, 11, 12, ... What number should come next?
A. 7 B. 10
C. 14 D. 15
Answer: Option D
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.
13. Look at this series: 8,
22, 8, 28, 8, ... What number should come next?
A. 9 B. 29
C. 32 D. 34
Answer: Option D
Explanation: This is a simple
addition series with a random number, 8, interpolated as every other number. In
the series, 6 is added to each number except 8, to arrive at the next number.
14. In following question, a
number series is given with one term missing. Choose the correct alternative
that will same pattern and fill in the blank spaces.
5, 9, 17, 29, 45,
A. 60 B. 65
C. 68 D. 70
Answer: B
Explanation: The pattern is + 4, + 8, + 12, + 16, ...
.'. Missing number = 45 + 20
= 65.
15. In following question, a
number series is given with one term missing. Choose the correct alternative
that will same pattern and fill in the blank spaces.
3, 7, 15, 31, 63,
A. 92 B.
115
C. 127 D. 131
Answer: C
Explanation: Each number in the series is the preceding
number multiplied by 2 and then increased by 1.
Thus, (3 * 2) + 1 = 7,
(7 * 2) + 1 = 15,
(15 * 2) + 1 = 31 and so on.
.'. Missing number = (63 * 2)
+ 1 =127.
16. In following question, a
number series is given with one term missing. Choose the correct alternative
that will same pattern and fill in the blank spaces.
1, 6, 15, , 45, 66, 91
A. 25 B. 26
C. 27
D. 28
Answer: D
Explanation: The pattern is + 5, + 9, ..., + 21, + 25
.'. Missing number = 15 + 13
= 28.
17. In following question, a
number series is given with one term missing. Choose the correct alternative
that will same pattern and fill in the blank spaces.
1, 2, 3, 5, 8,
A. 9 B.
11 C. 13 D. 15
Answer: C
Explanation: Each term in the series is the sum of the
preceding two terms.
Thus, 1 + 2 = 3,
2 + 3 = 5,
3 + 5 = 8 and so on.
.'. Missing number = 5 + 8 =
13.
18. Look at this series: 544,
509, 474, 439, ... What number should come next?
A. 404 B. 414
C. 420 D. 445
Answer: Option A
Explanation: This is a simple
subtraction series. Each number is 35 less than the previous number.
19. Look at this series: 8,
6, 9, 23, 87 , ... What number should come next?
A. 128 B. 226
C. 324 D. 429
Answer: Option D
Explanation:
8 x 1 - 2 = 6
6 x 2 - 3 = 9
9 x 3 - 4 = 23
23 x 4 - 5 = 87
87 x 5 - 6 = 429 ...
20. Look at this series: 5.2,
4.8, 4.4, 4, ... What number should come next?
A. 3 B. 3.3
C. 3.5 D. 3.6
Answer: Option D
Explanation: In this simple
subtraction series, each number decreases by 0.4.
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