# Quantitative Aptitude: Number Series Set 100

Directions(1-10): Find the missing term ‘?’ of the following series.

1. 17, 9, ?, 16.5, 35, 90
12
14
17
10
18
Option D
(×0.5 + 0.5), (×1 + 1), (×1.5 + 1.5), (×2 + 2)
9 × 1 + 1 = 10

2. 286 ,142, ?, 34, 16, 7
78
89
81
77
70
Option E
( 2 – 1), ( 2 – 1),..
142/2 – 1 = 71 –1 = 70

3. 3, 22, ?, 673, 2696, 8093
110
134
125
156
167
Option B
×7 + 1, ×6 + 2, ×5 + 3, ×4 + 4, ×3 + 5
22 × 6 + 2 = 134

4. 6, 13, 38, ?, 532, 2675
112
140
129
133
156
Option C
6 × 1 + 1 × 7 = 13
13 × 2 + 2 × 6 = 38
38 × 3 + 3 × 5 = 129
129 × 4 + 4 × 4 = 532

5. 20, 21, 25, 34, 50, ?, 111
80
66
70
75
89
Option D
20 + 1^2 = 21
21 + 2^2 = 25
25 + 3^2 = 34
34 + 4^2 = 50
50 + 5^2 = 75

6. 1, 2, 6, 21, 88, 445, ?
2552
2200
2676
2560
2525
Option C
1 × 1 + 1 = 2
2 × 2 + 2 = 6
6 × 3 + 3 = 21
21 × 4 + 4 = 88
88 × 5 + 5 = 445
445 × 6 + 6 = 2676

7. 17, 52, 158, 477, ?, 4310
1441
1450
1556
1435
1670
Option D
×3 + 1, ×3 + 2, ×3 + 3
477 × 3 + 4 = 1431 + 4 = 1435

8. 12, 15 , 36, ?, 480, 2415, 14508
100
117
120
145
132
Option B
12 × 1 + 3 × 1 = 15
15 × 2 + 3 × 2 = 36
36 × 3 + 3 × 3 = 117
117 × 4 + 3 × 4 = 480
480 × 5 + 3 × 5 = 2415

9. 600, 125, 30, ?, 7.2, 6.44, 6.288
15
20
25
11
36
Option D
600/5 + 5 = 125
125/5 + 5 = 30
𝟑𝟎/𝟓 + 5 = 11
11/ 5 + 5 = 7.2

10. 50, 60, 75, 97.5, ?, 184.275, 267.19875
113.324
131.625
125.520
100.616
110.132
Option B
50 × 1.20 = 60
60 × 1.25 = 75
75 × 1.30 = 97.5
97.5 × 1.35 = 131.625
131.625 × 1.40 = 184.275