Number Series Asked in RBI Grade B Manager (Phase-I) Exam - 04.09.2016 (1st Shift)

Directions (Q.1 -5): In the following number series only one number is wrong. Find out the wrong number. 

1. 18.3        20.6        16       22.9        13.7        2.2       11.4

a) 25.2

b) 18.3

c) 13.7

d) 22.9

e) 20.6

2. 9        5        6        10.5        23        61        183

a) 183

b) 10.5

c) 61

d) 5

e) 9 

3. 188        154        140       132       128       126       125

a) 125

b) 154

c) 132

d) 126

e) 188 

4. 2        4        11        37        151        771        4633

a) 11

b) 4633

c) 771

d) 151

e) 2 

5. 391        394        399       411        431       461        503

a) 503

b) 394

c) 399

d) 431

e) 391 

Solutions:

1. a) 25.2

18.3 + 2.3 = 20.6
20.6 - 4.6 = 16
16 + 6.9 = 22.9
22.9 - 9.2 = 13.7
13.7 +11.5 = 25.2
25.2 - 13.8 = 11.4

2. c) 61

9*0.5 + 0.5 = 5
5*1 + 1 = 6
6*1.5 + 1.5 = 10.5
10.5*2 + 2 = 23
23*2.5 + 2.5 = 60
60*3 + 3 = 183

3. e) 188

186 - 36 = 154
154 - 16 = 140
140 - 8 = 132
132 - 4 = 128
128 - 2 = 126
126 - 1 = 125

4. d) 151

2*1 + 2 = 4
4*2 + 3 = 11
11*3 + 4 = 37
37*4 + 5 = 153
153*5 + 6 = 771
771*6 + 7 = 4633

5. b) 394 

391 + 2 = 393
393 + 6 = 399
399 + 12 = 441
441+ 20 = 431
431 + 30 = 461
461 +40 = 503

Thanks.