Quantitative Aptitude: Number Series Set 11

Directions: What will come in place of (?) in following series following a certain pattern?

1. 6, 7, 16, 51, 208, ?
   A) 1081
   B) 1159
   C) 1066
   D) 1045
   E) 1160
   
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   Option D
   Pattern:
   *1 + 1, *2 + 2, *3 + 3, *4 + 4, *5 + 5.
   
2. 102, 79, 66, 47, 38, ?
   A) 41
   B) 39
   C) 23
   D) 12
   E) 40
   
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   Option C
   Pattern:  
   10^2 + 2, 9^2 – 2, 8^2 + 2, 7^2 – 2, 6^2 + 2, 5^2 – 2
    
3. 3, 5, 21, 115, 819,
   A) 7481
   B) 7389
   C) 7166
   D) 7245
   E) 7160
   
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   Option B
   Pattern:
   *1 + 2, *3 + 6, *5 + 10, *7 + 14, *9 + 18
   
4. 26, 13, 20, 51, 180,   
   A) 812
   B) 659
   C) 866
   D) 745
   E) 760
   
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   Option A
   Pattern:
   *0.5 + 0, *1.5 + 0.5, *2.5 + 1, *3.5 + 1.5, *4.5 + 2
5. 223, 167, 119, 79, 47, ?
   A) 31
   B) 29
   C) 26
   D) 35
   E) 23
   
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   Option E
   Pattern:
   15^2 – 2 = 223, 13^2 – 2 = 167, 11^2 – 2 = 119, 9^2 – 2 = 79, 7^2 – 2 = 47, 5^2 – 2 = 23
   
6. 2, 15, 42, 97, 208, ?
   A) 381
   B) 459
   C) 431
   D) 445
   E) 360
   
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   Option C
   Pattern:
   2*2 + 11, 15*2 + 12, 42*2 + 13, 97*2 + 14, 208*2 + 15
   
7. 3, 4, 15, 56, 285, ?
   A) 1681
   B) 1759
   C) 1666
   D) 1704
   E) 1660
   
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   Option D
   Pattern:
   *2 – 2, *3 + 3, *4 – 4, *5 + 5, *6 – 6
   
8. 16, 8, 6, 7, 14.5,  
   A) 50.75
   B) 61.55
   C) 58.25
   D) 70.45
   E) 51.60
   
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   Option C
   Pattern:
   *0.25  + 4, *0.5  + 2, *1  + 1, *2  + 0.5, *4 + 0.25
   
9. 1, 3, 10, 38, 168, ?
   A) 881
   B) 872
   C) 866
   D) 845
   E) 860
   
   View Answer

   Option B
   Pattern:
   *1 + 2, *2 + 4, *3 + 8, *4 + 16, *5 + 32
   
10. 2, 8, 15, 26, 46, ?
    A) 88
    B) 79
    C) 66
    D) 75
    E) 82
    
    View Answer

    Option E