# Quantitative Aptitude: Number Series Set 69

1. 15, 24, 38, ?, 81, 110
49
52
46
57
None
Option D
Solution:
15………. 24………. 38………. 57………. 81………. 110
………. 9…….. 14…….. 19…….. 24…….. 29……..
……………… 5 …….. 5…….. 5 …….. 5.
2. 7, 36, 125, 256, ?, 64
294
243
267
224
None
Option B
Solution:
71=7
62=36
53=125
44=256
35=243
26=64
3. 21, 8, 31, 13, 41, ?
18
51
36
22
None
Option A
Solution:
………. (31-21=10) ……… (41-31=10)
21……… 8……… 31……… 13……… 41……… 18
……………………. (13-8=5) ……………. (18-13=5).
4. 16, 8, 24, ?, 36, 18
15
14
12
16
None
Option C
Solution:
16/2 = 9
8*3 = 24
24/2 = 12
12*3 = 36
36/2 = 18.
5. 3, 5, ?, 17, 33, 65
11
9
12
15
None
Option B
Solution:
11 + 21=3
12 + 22=5
13 + 23=9
14 + 24=17
15 + 25=33
16 + 26=65.
6. 60, 32, 20, 18, 25, ?
28
22.6
36
44.5
None
Option D
Solution:
60/2+2=32
32/2+4=20
20/2+8=18
18/2+16=25
25/2+32=44.5.
7. 3, 2, 3, 6, 14, ?
34.5
37..5
25.5
28
None
Option B
Solution:
3 *0.5 + 0.5 = 2
2 *1 + 1 = 3
3 *1.5 + 1.5 = 6
6*2+2=14
14*2.5+2.5=37.5.
8. 14, 21, ?, 57, 88, 129
38
42
35
47
None
Option C
Solution:
21-14=7 (14-7=7)
35-21=14(22-14=8)
57-35=22 (31-22=9)
88-57=31(41-31=10)
129-88=41.
9. 50, 75, 175, ?, 800, 1425
290
365
386
400
None
Option D
Solution:
50+52=75
75+102=175
175+152=400
400+202=800
800+252=1425.
10. 2, 12, 36, 80, ?, 252
150
185
196
215
None
Option A
Solution:
13+1 2=2
23+2 2=12
33+3 2=36
43+4 2=80
53+5 2=150
63+6 2=252.

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