# Aptitude Questions – Number Series Set 63

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Welcome to Online Quantitative Aptitude Section in AffairsCloud.com. Here we are creating question sample in Number Series based on latest pattern, which is common for SBI,IBPS, RBI,LIC, NICL and other  competitive exams.

1. 1, 3, 5, 13, ?, 108
1. 55
2. 45
3. 65
4. 34
5. 25
Explanation :
1 * 1 + 1 + 1 = 3
3 * 1.5 + 1.5 – 1 = 5
5 * 2 + 2 + 1 = 13
13 * 2.5 + 2.5 – 1 = 34
34 * 3 + 3 + 1 = 106

2. 6 8 21 69 ? 1435
1.235
2.285
3.294
4.234
5.245
Explanation :
6*1 – 1 + 2 + 1 = 8
8*2 – 2 + 4 + 3 = 21
21*3 – 1 + 2 + 5 = 69
69*4 – 2 + 4 + 7 = 285
285*5 – 1 + 2 + 9 = 1435

3. 2, 6, 15, ?, 111, 378
1.38
2.27
3.56
4.44
5.62
Explanation :
2 + 1² + 1 + 2 = 6
6 + 2² + 1 + 4 = 15
15 + 4² + 1 + 6 = 38
38 + 8² + 1 + 8 = 111
111 + 16² + 1 + 10 = 378

4. 4, 8, 14, 36, ?, 300
1.99
2.97
3.94
4.98
5.96
Explanation :
4 * 1 + 2 + 2 = 8
8 * 1.5 + 4 – 2 = 14
14 * 2 + 6 + 2 = 36
36 * 2.5 + 8 – 2 = 96
96 * 3 + 10 + 2 = 300

5. 3, ?, 13, 41, 87, 171
1.9
2.5
3.6
4.7
5.2
Explanation :
3 + 1² + 3 = 7
7 + 3² – 3 = 13
13 + 5² + 3 = 41
41 + 7² – 3 = 87
87 + 9² + 3 = 171

6. 6, 6, 8, ?, 92, 276
1.33
2.53
3.38
4.24
5.44
Explanation :
6*1 – 1 + 1 = 6
6*2 – 2 – 2 = 8
8*3 – 1 + 1 = 24
24*4 – 2 – 2 = 92
92*3 – 1 + 1 = 276

7. 2, 1, 13, 34, 106, ?
1.232
2.218
3.221
4.225
5.242
Explanation :
2 + 1³ – 2 = 1
1 + 2³ + 4 = 13
13 + 3³ – 6 = 34
34 + 4³ + 8 = 106

8. 1, 5, 21, 81, ?, 1309
1.375
2.329
3.365
4.383
5.355
Explanation :
1 * 4 – 1 + 2 = 5
5 * 4 + 3 – 2 = 21
21 * 4 – 5 + 2 = 81
81 * 4 + 7 – 2 = 329
329 * 4 – 9 + 2 = 1309

9. 2, ?, 11, 17, 43, 81
1.3
2.5
3.7
4.8
5.9
Explanation :
2*2 – 2 + 1 = 3
3*2 + 4 + 1 = 11
11*2 – 6 + 1 = 17
17*2 + 8 + 1 = 43
43*2 – 6 + 1 = 81

10. 2, 4, 4, 18, 64, ?
1.340
2.380
3.330
4.370
5.320