Aptitude Questions: Number Series Set 16

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1. 67, 68, 64, 73 , ?
   A)57
   B)53
   C)65
   D)73
   

   Answer & Solution

   Answer – A)57
   Solution:
   67+1^2 = 67+1 = 68
   68-2^2 = 68-4 = 64
   64+3^2 = 64+9 = 73
   73-4^2 = 73-16 = 57
   
   
   
2. 131, 138, 154, 188 ?
   A)243
   B)249
   C)224
   D)232
   

   Answer & Solution

   Answer – B)249
   Solution:
   131+7 = 138………….(7)
   138+16 = 154…………(7+9 = 16)
   154+34 = 188…………(16+18 = 34)
   188+61 = 249………..(34+27 = 61)
   
   
   
3. 657, 679, 712, 756, ?
   A)814
   B)824
   C)811
   D)921
   

   Answer & Solution

   Answer – C)811
   Solution:
   657+22 = 679
   679+33 = 712
   712+44 = 756
   756+55 = 811
   
   
   
4. 27, 54, 324, 5832, ?
   A) 341982
   B) 314892
   C) 341928
   D) 314928
   

   Answer & Solution

   Answer – D) 314928
   Solution:
   27*2=54
   54*6 =324…..(2*3 =6)
   324*18 = 5832….(6*3)
   5832*54 =314928….(18*3=54)
   
   
   
5. 39, 40, 162, 1461, ?
   A)37231
   B)23737
   C)23380
   D)27733
   

   Answer & Solution

   Answer – C)23380
   Solution:
   39*1^2+1 = 39+1 = 40
   40*2^2+2 = 40*4+2 = 162
   162*3^2+3 = 162*9+3 = 1461
   1461*4^2+4 = 23380
   
   
   
6. 23, 22, 40, 111, ?
   A)428
   B)563
   C)462
   D)436
   

   Answer & Solution

   Answer – A)428
   Solution:
   23*1 -1^2 = 23-1 = 22
   22*2-2^2 = 44 – 4 = 40
   40*3-3^2 = 120 – 9= 111
   111*4-4^2 = 444-16 = 428
   
   
   
7. 13, 27, 83, 335, ?
   A)1729
   B)1679
   C)1972
   D)1277
   

   Answer & Solution

   Answer – B)1679
   Solution:
   13*2+1 = 27
   27*3+2 = 83
   83*4+3 = 335
   335*5+4 = 1679
   
   
   
8. 217, 221, 231, 249, ?
   A)246
   B)264
   C)256
   D)277
   

   Answer & Solution

   Answer – D)277
   Solution:
   217+(3^2-5) = 217+4 = 221
   221+(4^2-6) = 221+10 = 231
   231+(5^2-7) = 231+18 = 249
   249+(6^2-8) = 249+28 = 277
   
   
   
9. 156, 76, 150, 73 ,144, ?
   A)75
   B)86
   C)70
   D)88
   

   Answer & Solution

   Answer – C)70
   Solution:
   156÷2-2 = 76
   76*2-2 = 150
   150÷2-2 = 73
   73*2 – 2 = 144
   144 ÷2-2 = 70
   
   
   
10. 1723, 1602, 1521, 1472, ?
    A)1447
    B)1432
    C)1471
    D)1747
    

    Answer & Solution

    Answer – A)1447
    Solution:
    1723-11^2 = 1723 – 121 =1602
    1602-9^2 = 1602-81 = 1521
    1521-7^2 = 3248 – 49 = 1472
    1472-5^2 = 3199-25 = 1447
    
    
    

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