Series Based Questions for IBM Placement Test 2

Another Series based important questions for IBM placement preparation and Interview Preparation. Series Completion Questions are very important for IBM placements and interviews. With the help of this compilation you will surely perform well in IBM placement and Interviews.

Question: Select correct option:
1, 3, 4, 8, 15, 27, ?

(a) 37
(b) 44
(c) 50
(d) 55

Answer: (c)

Solution:

1+3=4
1+3+4=8
3+4+8=15
4+8+15=27
8+15+27=50

Question: What will be the next element?

1,3,4,5,13,2,3,4,22,1,2,3,?

(a) 28

(b) 4

(c) 1

(d) 12

Answer: (a)

Solution:

1+3+4+5=13, 13+2+3+4=22, 22+1+2+3=28

Question: What will be the next element?

48,24,35,7,16,8,75,15,80,?

(a) 8

(b) 4

(c) 40

(d) 20

Solution:

48/2=24 35/5=7
16/2=8 75/5=15
80/2=40
Therefore the answer is 40.

Question: What will be the next element?

5,10,9,3,6,5,4,8,7,7,?

(a) 12

(b) 9

(c) 14

(d) 23

Solution:

Since,

5*2=10 10-1=9
3*2=6 6-1=5
4*2=8 8-1=7

Therefore, 7*2=14

Question: What will be the next element?

7, 4, 6, 3, 4.5, 1.5, 2.25, -0.75,?

(a) -3.25

(b) -1.125

(c) -4

(d) -1

Solution:

The series is:

7-3=4; 4*(3/2)=6
6-3=3; 3*(3/2)=4.5
4.5-3=1.5; 1.5*(3/2)=2.25

Therefore,
2.25-3=-0.75; -0.75*(3/2)= -1.125

Question: Replace ‘?’ with appropriate option:

1/4, 1/4, 1/2, 3/2, 6, ?

(a) 1/6

(b) 30

(c) 8

(d) 1/8

Answer: (b)

Solution:

Series is: ¼ * 1= ¼

¼ * 2= ½

½ * 3= 3/2

3/2 * 4= 6

Therefore,

6* 5= 30  

Question: What will be the next element?

49,7,98,16,4,48,9,3,36,25,5,?

(a) 8

(b) 9

(c) 125

(d) 625

Answer: (c)

Solution:

Series is: 7^2,7,49*2
4^2, 4, 16*3
3^2, 3, 9*4

Therefore
5^2, 5, 25*5=125

Question: What will be the next element?

507, 169, 248, 62, 36, 12, 168, 42, 168, ?

(a) 56

(b) 80

(c) 69

(d) 96

Answer: (a)

Solution:

The series is: 507= 169*3,

248= 62*4 
12*3=36

42*4=168,

Therefore,
56*3=168

Question: What will be the next element?

1, 3, 1, 2.5, 5, 1, 4, 5, 4, 8, 7, ?

(a) 10

(b) 20

(c) 8.5

(d) 9.5

Answer: (d)

Solution:

The series is as follows:

1+3+1=5 /2=2.5
5+1+4=10 /2=5

Therefore, 4+8+7=19 /2=9.5

Question: What will be the next element?

13, 24, 36, 23, 34, 56, ?

(a) 33

(b) 35

(c) 43

(c) 53

Answer: (a)

Solution: 13+10=23

23+10= 23

Therefore, 23+10= 33