Quantitative Aptitude: Number Series Set 3

< Directions: The following series are based on a specific pattern. In these series one number is wrong, find that odd one.

7, 23, 57, 109, 191, 307
A) 191
B) 307
C) 109
D) 57
E) 23

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Option D
Pattern:
2³ – 1², 3³ – 2², 4³ – 3², 5³ – 4², ….
128, 72, 96, 240, 840, 3780
A) 96
B) 72
C) 240
D) 3780
E) 840

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Option B
Pattern:
112×0.5, 56×1.5, 84×2.5, 210×3.5,
145, 170, 195, 224, 252, 290
A) 224
B) 170
C) 252
D) 195
E) 290

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Option C
Pattern:
12²+1, 13²+1, 14²-1, 15²-1, 16²+1,
23, 12, 13, 21, 44, 170, 340.5
A) 12
B) 13
C) 21
D) 44
E) 170

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Option E
Pattern:
11*0.5 + 0.5, 6*1 + 1, 7*1.5 + 1.5, 12*2 + 2, 26*2.5 + 2.5
4, 5, 11, 39, 175, 1127, 7881
A) 1127
B) 175
C) 5
D) 11
E) 39

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Option B
Pattern:
×2 – 3, ×3 – 4, ×4 – 5, ×5 – 6, ×6 – 7
6, 9, 30, 90, 432, 2520
A) 9
B) 432
C) 90
D) 30
E) 2520

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Option D
Pattern:
6×2 – 6/2, 9×3 – 9/3, 24×4 – 24/4, 90×5 – 90/5, 432×6 – 432/6
10, 6, 14, 9, 32, 16, 80
A) 9
B) 14
C) 6
D) 32
E) 16

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Option B
Pattern:
– 2², + 2³, – 3², + 3³, – 4²,
5760, 352, 40, 8, 6.5, 2.5
A) 8
B) 6.5
C) 40
D) 352
E) 2.5

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Option B
Pattern:
5760/16 – 16/2 = 352
352/8 – 8/2 = 40
40/4 – 4/2 = 8
8/2 – 2/2 = 3
3/1 – 1/2 = 2.5
6, 9, 23, 55, 92, 151, 229
A) 151
B) 92
C) 55
D) 23
E) 229

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Option C
Pattern:
8, 2, 2, 4.5, 25, 112.5, 1012.5
A) 1012.5
B) 112.5
C) 4.5
D) 25
E) None of these

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Option D
Pattern:
× 0.5², × 1², × 1.5², × 2², × 2.5²