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Number Series Asked in IBPS RRB OS - V (Prelim) Exam - 06.11.2016 (1st Shift)

Published on Monday, April 24, 2023
Directions (1-5): What should come in place of the question mark (?) in the following number series?

#1.

4, 16, 26, 34, 40, ?
a) 45
b) 46
c) 43
d) 55
e) 44

#2.

825, 582, 501, 474, 465,?
a) 484
b) 642
c) 246
d) 462
e) 532

#3.

8, 12, 24, 60, 180, ?
a) 360
b) 300
c) 630
d) 600
e) 720

#4.

3, 4, 10, 33, 136, ?
a) 586
b) 685
c) 569
d) 690
e) 265

#5.

16, 17, 13, 22, 6, ?
a) 31
b) 2
c) 1
d) 12
e) 13


Solutions :



1. e) 44

Solution:
4………16……….26………..34…...….40………
…….+12…..+10…..…..+8…..…...+6….…...+4
Answer: 40 + 4 = 44

2. d) 462

Solution:
825…….…..582….…..501….…..474……..465………
……..-243…...…-81………-27…….…-9…….…-3…
Answer: 465 – 3 = 462

3. c) 630

Solution:
8 x 1.5 = 12
12 x 2 = 24
24 x 2.5 = 60
60 x 3 = 180
180 x 3.5 = 630

4. b) 685
Solution:
3 x 1 + 1 = 4
4 x 2 + 2 = 10
10 x 3 + 3 = 33
33 x 4 + 4 = 136
136 x 5 + 5 = 685

5. a) 31

Solution:
16………..17……..13……....22……..6……
…...+1…........-4……....+9…….-16……(+25)
….(1 x 1)….(2 x 2)….(3x 3)….(4x4)....(5 x 5)
Answer: 6+25= 31

Thanks.

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