Reasoning For IBPS PO/Clerk

Number Series questions 

 1.  3     1731     ?     3243     3459     3523
A.2371

B.2731
C.3731
D.3127
E.None of these

 2. 10     18     34     ?     130     258
A.32
B.60
C.66
D.68
E.None of these

 3. 4     10     33     136     ?     4116
A.822
B.534
C.685
D.745
E.548

 4. 4000     800     ?     80     40     8
A.140
B.100
C.400
D.160
E.200

 5.  8     10     18     44     124     ?
A.344
B.366
C.354
D.356
E.None of these

 6. 13     25     61     121     205     ?
A.323
B.326
C.324
D.313
E.None of these

 7. 656     352     200     124     86     ?
A.67
B.59
C.62
D.57
E.None of these

 8. 454     472     445     463     436     ?
A.436
B.456
C.454
D.434
E.None of these

 9. 12     18     36     102     360     ?
A.1364
B.1386
C.1384
D.1376
E.None of these

 10. 3     4     16     75     364     ?
A.783
B.828
C.1293
D.1945
E.None of these

ANSWERS with explanation

1. The pattern is :
3523 – 3459 = 64 = 4³
3459 – 3243 = 216 = 6 ³
? = 3243 – 8 ³ = 3243 – 512 = 2731
2731 – 1731 = 1000 = 10³
1731 – 3 = 1728 = 12³

2.  The pattern is :-
10 x 2 – 2 = 20 – 2 = 18
18 x 2 – 2 = 36 – 2 = 34
34 x 2 – 2 = 68 – 2 = 66
66 x 2 – 2 = 132 – 2 = 130

3.  The pattern is :-
4 x 2 + 2 = 10
10 x 3 + 3 = 33
33 x 4 + 4 = 136
136 x 5 + 5 = 680 + 5 = 685

4. The pattern is –
4000 ÷ 5 = 800
800 ÷ 2 = 400
400 ÷ 5 = 80
80 ÷ 2 = 40
40 ÷ 5 = 8

5. The pattern of the number is –
8 + 2 = 10
10 + 8 (= 2 x 3 + 2) = 18
18 + 26 (=3 x 8 + 2) = 44
44 + 80 (=3 x 26 + 2) = 124
124 + 242 (=3 x 80 + 2) = 366

6. The pattern of the number series is –
13 + 1 x 12 = 13 + 12 = 25
25 + 33 x 12 = 25 x 36 = 61
61 + 5 x 12 = 66 x 60 = 121
121 + 7 x 12 = 121 + 84 = 205
205 + 9 x 12 = 205 + 108 = 313

7.  The pattern of the number series is-
656/2 + 24 = 328 + 24 = 352
352/2 + 24 = 176 + 24 = 200
200/2 + 24 = 100 + 24 = 124
124/2 + 24 = 62 + 24 = 86
86/2 + 24 = 43 + 24 = 67

8.  The pattern of the number series is –
454 + 18 = 472
472 – 27 = 445
445 + 18 = 463
463 – 27 = 436
463 + 18 = 454

9. The pattern of the number series is-
12 x 4 – 30 = 48 – 30 = 18
18 x 4 – 36 = 72 – 36 = 36
36 x 4 – 42 = 144 – 42 = 102
102 x 4 – 48 = 408 – 48 = 360
360 x 4 – 54 = 1440 – 54 =1386

10.  The pattern of the number series is –
3 x 1 + 1 ³ = 4
4 x 2 + 2 ³ = 8 + 8 = 16
16 x 3 + 3 ³ = 48 + 27 = 75
75 x 4 + 4 ³ = 300 + 64 = 364
364 x 5 + 5 ³ = 1820 + 125 = 1945