Number Series Questions for IBPS PO Mains


Direction (1-10) : What value should come in place of question-mark (?) in the following number series?

Ques 1. 78, 294, 419, 483, ?
1. 518
2. 505
3. 515
4. 510
5. 516

Ques 2. 16, 26, 6, 46, -34, ?
1. 126
2. 116
3. 124
4. 118
5. 125

Ques 3. 174, 232, 298, 372, ?
1. 544
2. 464
3. 454
4. 474
5. 445

Ques 4. 17, 35, 109, 445, ?
1. 2214
2. 2231
3. 2411
4. 2421
5. 2241

Ques 5. 1498, 1473, 1437, 1388, ?
1. 1342
2. 1324
3. 1314
4. 1332
5. 1334

Ques 6. 8, 9, 20, 63, ?
1. 266
2. 265
3. 256
4. 255
5. 257

Ques 7. 4, 13, 84, 253, ?
1. 628
2. 682
3. 627
4. 632
5. 678

Ques 8. 5, 25, 97, 281, ?
1. 660
2. 662
3. 664
4. 661
5. 663

Ques 9. 4, 15, 16, 38, 36, ?
1. 64
2. 69
3. 68
4. 66
5. 65

Ques 10. 11, 36, 111, 336, ?
1. 1030
2. 1015
3. 1011
4. 1031
5. 1025

Solution:

1. 4; 
The series is 

∴ ? = 483 + 3³ = 510

2. 1; 
The series is 

∴ ? = 34 + 160 = 160 = 126

3. 3; 
The Series is , 13² + 5 = 174, 15² + 7 = 232,17² + 9 = 298, 19² + 11 = 372, ...
∴ ? = 21∴ + 13 = 454

4. 5; 
The series is 

∴ ? = 445 x 5 + 16 = 2241

5. 2; 
The series is 

∴ ? = 1988 - 64 = 1324
6. 3;

∴ ? = 63 x 4+4 = 256

7. 1;
The series is : 1⁴ + 3 = 4,2 ⁴ - 3 = 13,
3⁴ + 3 =84,4⁴ - 3 = 253, ....
∴ ? = 5⁴ + 3 = 625 + 3 =628

8. 4;
The series is : 1⁴ + 2² = 5, 2⁴ + 3² = 25,3⁴ + 4² = 97,
4⁴+5² = 281,....
?=5⁴ + 6² = 661

9. 2;
The series is : 2² = 4,2² + 11 = 15,4² = 16,4² + 22 = 38,
6² = 36,......
? = 6² + 33 = 36+33 = 69

10. 3;
The series is : 
11+(11 x 2+3) = 36
36+(36 x 2+3) = 111
111+(111 x 2+3) = 336
∴ ? = 336 +
(336 x 2 + 3 ) = 1011


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