# Quantitative Aptitude: Number Series 31

Quantitative Aptitude Questions for IBPS RRB/PO/Clerk, SBI PO, NIACL, NICL, RBI Grade B/Assistant, UIICL, OICL and other competitive exams

Directions(1-5): Find the missing number in the following number series.

1. 20     24     33    49     74     ?
A) 115
B) 88
C) 96
D) 110
E) 123
Option D
Solution:
20 + 2^2 = 24
24 + 3^2 = 24
33 + 4^2 = 49
49 + 5^2 = 74
74 + 6^2 = 110
2. 1     ?     27    64     125
A) 8
B) 11
C) 12
D) 16
E) None of these
Option A
Solution:
1  = 1^3
? = 2^3 = 8
3 = 3^3
4 = 4^3
5 = 5^3
3. 12   14    17    13   ?   14   21    13
A) 11
B) 8
C) 10
D) 12
E) None of these
Option B
Solution:

12…..(+2)……14….(+3)…..17…..
(-4)……13……(-5)……8……(+6)……14……(+7)…..21…..(-8)…..13
+2, +3, -4, -5, +6, +7, -8
4. 5    11     ?      55      117
A) 22
B) 25
C) 33
D) 30
E) None of these
Option B
Solution:
5  * 2 + 1 = 11
11 * 2 + 3 = 25
25 * 2 + 5 = 55
55 * 2 + 7 = 117
5. 85     43    44    67.5     ?     345
A) 125
B) 140
C) 137
D) 112
E) None of these
Option C
Solution:
85 * 0.5 + 0.5 = 43
43 * 1 + 1 = 44
44 * 1.5 + 1.5 = 67.5
? = 67.5 * 2  + 2 = 137
137 * 2.5 + 2.5 = 345

Directions(6-10): In each of the following questions number series, there is a wrong number that does not follow the pattern of the series. Find the wrong number.

1. 62    87    187    420    812    1437
A) 87
B) 187
C) 420
D) 812
E) None of these
Option C
Solution:
62 + 5^2 = 62 + 25 = 87
87 + 10^2 = 87 + 100 = 187
187 + 15^2 = 187 + 225 = 412
412 + 20^2 = 412 + 400 = 812
812 + 25^2 = 812 + 625 = 1437
2. 120    137    170    222    290   375
A) 137
B) 170
C) 222
D) 290
E) 375
Option B
Solution:
120 + 1 * 17 = 137
137 + 2 *17 = 171
171 + 3 * 17 = 222
222 + 4 * 17 = 290
290 + 5 * 17 = 375
3. 550   542   537   521    496   460
A) 496
B) 521
C) 537
D) 542
E) 460
Option D
Solution:
550 – 2^2 = 546
546 – 3^2 = 537
537 – 4^2 = 521
521 – 5^2 = 496
496 – 6^2 = 460
4. 12      48     168     500    1260   2520
A) 500
B) 168
C) 48
D) 1260
E) 2520
Option A
Solution:
12 * 4 = 48
48 * 3.5 = 168
168 * 3 = 504
504 * 2.5 = 1260
1260 * 2 = 2520
5. 24   536   487    703     670    742
A) 536
B) 487
C) 670
D) 703
E)742
Option C
Solution:
24 + 8^3 = 536
536  – 7^2 = 487
487 + 6^3 = 703
703 – 5^2 = 678
678 + 4^3 = 742

## 10 Thoughts to “Quantitative Aptitude: Number Series 31”

1. Himanshu ਅਰੋੜਾ(Phenomenal)

thanx 🙂

2. Jeetesh Chandra

ty az..))

3. Sachin shukla( Banker 2018)

ty)))Good qsns

4. ครђ

:)) Nice set ma’am !!

Thanks (;

5. !!angry bird !!

ty mam:)

6. jaga

thank u mam 🙂

7. EKTA

thankx mam

8. swati

amazing set…. thank you teamAZ

9. ~lonely~hanker~nitrous oxide~

tq कैक्टस katedar