Number Series for IBPS CWE PO - VI Prelim Exam (Set-1)

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

1. 1, 7,  49,  343, (?)
a) 16807
b) 1227
c) 2058
d) 2401
e) None of these


2. 13,  20, 39, 78, 145, (?)
a) 234
b) 244
c) 236
d) 248
e) None of these

3. 12        35        81        173        357        (?)
a) 725
b) 715
c) 726
d) 736
e) None of these

4. 3, 100, 297, 594, 991, (?)
a) 1489
b) 1479
c) 1478
d) 1498
e) None of these

5. 112, 119, 140, 175, 224, (?)
a) 277
b) 276
c) 287
d) 266
e) None of these


Answers:

1. d.) 2401

Solution:
1 x 7 = 7
7x 7 = 49
49 x 7 = 343
343 x 7 = 2401
 
2. d) 248

Solution:
13+12^2+3, 20+ 4^2+3, 39+6^2+3, 78+8^2+3, 145+ 10^2+3
 
3. a) 725

Solution:
difference x 2
 
4. e) none

Solution:
+97,+197+297,+397,+497

991+497 = 1488

5. c) 287

Solution:
+ 7x1, +7x3, +7x5, +7x7, +7x9

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