Quantitative Aptitude: Number Series 35

Quantitative Aptitude Questions for IBPS RRB/PO/Clerk, SBI PO, NIACL, NICL, RBI Grade B/Assistant, UIICL, OICL and other competitive exams.

Directions(1-5): What will come in the place of the question mark (?) in the following number series ?

14 6 5 6.5 12 ?
A) 22
B) 20
C) 25
D) 29
E) 30

View Answer
Option D
Solution:
14 *(1/2) – 1 = 7 – 1 = 6
6 * 1 – 1 = 6 – 1 = 5
5 *(3/2) – 1 = 7.5 – 1 = 6.5
6.5 *(4/2) – 1 = 13 – 1 = 12
12 *(5/2) – 1 = 30 – 1 = 29
47 23 11 5 2 ?
A) 0.5
B) 1.15
C) 2.5
D) 1.25
E) 3.5

View Answer
Option A
Solution:
(47-1)/2 = 46/2 = 23
(23-1)/2 = 22/2 = 11
(11-1)/2 = 10/2 = 5
(5-1)/2 = 4/2 = 2
(2-1)/2 = ½ = 0.5
1 3 10 ? 152 770 4632
A) 40
B) 15
C) 30
D) 36
E) 43

View Answer
Option C
Solution:
1*1 +2 =3
3*2+4=10
10*3+6=36
36*4+8=152
152*5+8=770
770*6+12=4632
4 5 9 ? 111 556 3335
A) 20
B) 28
C) 18
D) 22
E) 13

View Answer
Option B
Solution:
4 *1+1 = 5
5*2-1 = 9
9*3 +1 =28
28*4-1=111
111*5+1=556
556*6-1=3335
10 15 30 75 ? 787.5
A) 180
B) 200
C) 210
D) 150
E)225

View Answer
Option E
Solution:
10*1.5 = 15
15*2=30
30*2.5=75
75*3=225
225*3.5=787.5

Directions(6-10): In the following number series only one number is wrong. Find out the wrong number.
39 43 55 60 87 103 167
A) 103
B) 55
C) 43
D) 60
E) 39

View Answer
Option B
Solution:
39 +2^2 = 39 + 4 = 43
43 + 2^3 = 43 + 8 = 51
51 + 3^2 = 51 + 9 = 60
60 + 3^3 = 60 + 27 = 87
87 + 4^2 = 87 + 16 = 103
103 + 4^3 = 103 + 64 = 167
158 77 38 18 8 3
A) 3
B) 18
C) 8
D) 77
E) 158

View Answer
Option D
Solution:
(158/2) – 1 = 79 – 1 = 78
(78/2) – 1 = 39 – 1 = 38
(38/2) – 1 = 19 – 1 = 18
(18/2) – 1 = 9 – 1 = 8
(8/2) – 1 = 4 – 1 = 3
16 15 19 10 26 2 37
A) 26
B) 2
C) 10
D) 16
E) 15

View Answer
Option B
Solution:
16 – 1^2 = 15
15 + 2^2 = 19
19 – 3^2 = 10
10 + 4^2 = 26
26 – 5^2 = 1
1 + 6^2 = 37
20 23 30 44 64 95
A) 44
B) 20
C) 64
D) 30
E) 95

View Answer
Option A
Solution:
20 + 3 = 23
23 + 7 (=3+4) = 30
30 + 13 (=7+6) = 43
43 + 21(=13+6) = 64
64 + 31 (=21 +10) = 95
4 5.8 10.5 16.6 14.4 59.8
A) 14.4
B) 5.8
C) 4
D) 10.5
E) 59.8

View Answer
Option D
Solution:
4 + 1.8 *1= 4 + 1.8 = 5.8
5.8 + 1.8 *2 = 5.8 + 3.6 = 9.4
9.4 + 3.6 *2 = 9.4 + 7.2 = 16.6
16.6 +7.2*2 = 16.6 + 14.4= 31
31 + 14.4*2 = 31 + 28.8 = 59.8

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chinnu

September 7, 2017 at 2:37 pm

ma’am in 1st questn instead of 5 (second) 6.5 and in 4th ques 3335 instead of 3325
1. Banya
  
  September 8, 2017 at 4:52 am
  
  yes .. now it is corrected.
_/_

September 7, 2017 at 5:35 pm

ty
Chotu D(mind) !! {NONSENSE}

September 7, 2017 at 8:00 pm

done..9/10
kumkum ahuja

September 7, 2017 at 8:43 pm

ty az
Mission RRB PO

September 7, 2017 at 10:11 pm

mam
check ques 8th
1. Banya
  
  September 8, 2017 at 4:52 am
  
  corrected
  1. Mission RRB PO
    
    September 8, 2017 at 11:39 am
    
    thanks 🙂
jaga

September 8, 2017 at 12:39 am

mam q8 wrong hai.
1. Banya
  
  September 8, 2017 at 4:52 am
  
  corrected.
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