Expected Questions of Number Series for IBPS Clerk 2017

Directions: Find the wrong term of the following number series:
Q1. 3   6   15   45   113   243
Options:
a. 6
b. 45
c. 243
d. 3
e. 15
Q2. 33   39   56   85   127   178
Options:
a. 178
b. 127
c. 39
d.56
e. 85
Q3. 13   27   45   117   333   981   2925
Options:
a.981
b.333
c.117
d.27
e.2925
Q4. 7   4   9   21   52.5   160.5
Options:
a. 160.5
b. 21
c. 4
d. 7
e. 21

Q5. 7   9   21   67   275
Options:
a. 7
b. 67
c. 275
d. 21
e. 9
Answer Index: Q1-(c), Q2-(a), Q3-(d), Q4-() and Q5-(c)
Shortcut Solution:
Sol#Q1. 3*2=6, 15*3=45, 113*4=452
So, 243 is the wrong term in this series, 452 had to be in place of 243.
Sol#Q2. Correct series is:










So, 178 is the wrong term in this series, 183 had to be in place of 178.
Sol#Q3. Logic is: *3+18
Correct Series is: 13   21   45   117   333   981   2925
So, 27 is the wrong term in this series, 21 had to be in place of 27.
Sol#Q4. Pattern is:
(7×0.5)+0.5=4
(4×1)+1=5
(5×1.5)+1.5=9
(9×2)+2=20
(20×2.5)+2.5=52.5

(52.5×3)+3=160.5
So, 21 is the wrong term in this series, 20 had to be in place of 21.
Sol#Q5. Logic is: *1+2, *2+3, *3+4, *4+5,...........
So, 275 is the wrong term in this series, 273 had to be in place of 275.

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