Aptitude Questions – Number Series Set 63

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1. 1, 3, 5, 13, ?, 108
   1. 55
   2. 45
   3. 65
   4. 34
   5. 25
   
   Answer & Explanation

   Answer – 4. 34
   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
   
   Answer & Explanation

   Answer – 2.285
   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
   
   Answer & Explanation

   Answer – 2.27
   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
   
   Answer & Explanation

   Answer – 5.93
   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
   
   Answer & Explanation

   Answer – 4.7
   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
   
   Answer & Explanation

   Answer – 4.24
   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
   
   Answer & Explanation

   Answer – 3.221
   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
   
   Answer & Explanation

   Answer – 2.329
   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
   
   Answer & Explanation

   Answer – 1.3
   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
    
    Answer & Explanation

    Answer – 3.330
    Explanation :
    2 * 1 + 2 = 4
    4 * 2 – 4 = 4
    4 * 3 + 6 = 18
    18 * 4 – 8 = 64
    64 * 5 + 10 = 330