# Quantitative Aptitude: Number Series Set 116

Find what comes in the question mark.

1. 0.8.. 3.8.. 12.6.. 44.8..?
188.2
180.2
88.2
198.2
168.2
Option A
0.8 × 1 + 3 = 3.8
3.8 × 2 + 5 = 12.6
12.6 × 3 + 7 = 44.8
44.8 × 4 + 9 = 188.2

2. 33 .. 110.. 453.. 2282.. ?
13711
12467
12345
13423
15672
Option A
13 × 2 + 7 = 33
33 × 3 + 11 = 110
110 × 4 + 13 = 453
453 × 5 + 17 = 2282
2282 × 6 + 19 = 13711

3. 664.. 334.. 85.5.. ?.. 4.03125 ..
16
15
25.25
16.25
15.25
Option D
664 + 4 ÷ 2 = 334
334 + 8 ÷ 4 = 85.5
85.5 + 12 ÷ 6 = 16.25
16.25 + 16 ÷ 8 = 4.03125

4. 1 .. 3.. 7.. 13.. 22.. ? ..
30
34
21
31
33
Option
1 + 1 + 1 = 3
3 + 2 + 2 = 7
7 + 3 + 3 = 13
13 + 4 + 5 = 22
22 + 5 + 7 = 34

5. 5 .. 41.. 321.. 1921.. ?..
7681
Option
5 × 10 – 9 = 41
41 × 8 – 7 = 321
321 × 6 – 5 = 1921
1921 × 4 – 3 = 7681

6. 384.. 381.. 372.. 345.. ?
100
101
102
103
104
Option C
-3, -9, -27 ,-81 -243, ….

7. 12.. 14.. 32.. 102 ..?..
Option
clue: ×1 + 2, ×2 + 4, ×3 + 6, ×4 + 8, ×5 + 10

8. 841.. 961… 1089.. ?.. 1369 ..
1225
1125
1325
1432
1200
Option A
clue: +120, +128, +136, +…. +160, ….

9. 1108.. 1117.. 1142.. 1191 .. ?..
Option
clue: +3^2, +5^2, +7^2, +11^2, +13^2,….

10. 529.. 841.. 961.. ? .. 1681
1432
1345
1234
1369
1145
Option
clue:square of prime numbers from 23

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