Series Set – 28

1. 0, 3, 17, 50, 110, ?
A) 115
B) 205
C) 239
D) 188
E) 252

Answer & Explanation

  Option B
Pattern:
0 + 1 × 3 = 3
3 + 2 × 7 = 17
17 + 3 × 11 = 50
50 + 4 × 15 = 110
110 + 5 × 19 = 205

 

2. 1, 2, 6, 21, ?, 445
A) 88
B) 153
C) 99
D) 123
E) 141

Answer & Explanation

 Option A
Pattern:  
1 × 1 + 1 = 2
2 × 2 + 2  = 6
6 × 3 + 3  = 21
21 × 4 + 4 =  88
88 × 5 + 5  = 445

 

3. 2, 8, 44, 288, 2344, ?
A) 24300
B) 23500
C) 22400
D) 23900
E) None of these

Answer & Explanation

 Option B
Pattern:
2 × 2 + 2 × 2 = 8
8 × 4 + 4 × 3 = 44
44 × 6 + 6 × 4 = 288
288 × 8 + 8 × 5 = 2344
2344 × 10 + 10 × 6 = 23500

 

4. 10, 10, 16, 31, ?, 184
A) 76
B) 94
C) 85
D) 70
E) 106

Answer & Explanation

  Option D
Pattern:
10 × 0.5 + 5  = 10
10 × 1 + 6  = 16
16 × 1.5 + 7  = 31
31 × 2 + 8  = 70
70 × 2.5 + 9 = 184

 

5. 120, 60, 40, 30, 24, ?
A) 20
B) 18
C) 15
D) 22
E) 21

Answer & Explanation

 Option A
Pattern:
120 × (1/2) =  60
60 × (2/3) = 40
40 × (3/4) =30
30 × (4/5) = 24
24 × (5/6) = 20

 

6. 8, 24, 45, 81, ?, 238
A) 173
B) 131
C) 128
D) 142
E) 195

Answer & Explanation

  Option D
Pattern:
8 + 16 = 24
24+ 21 (= 16 + 1 × 5) = 45
45 + 36 (=21 + 3 × 5) = 81
81 + 61 (=36 + 5 × 5) = 142
142 + 96 (=61 + 7 × 5) = 238

 

7. 5, 30, 6, 24, 8, ?
A) 18
B) 16
C) 20
D) 13
E) 15

Answer & Explanation

  Option B
Pattern:
5 × 6 = 30
30/5 = 6
6 × 4 = 24
24/3 = 8
8 × 2 = 16

 

8. 16, 16, 24, 60, 270, ?
A) 2735
B) 2295
C) 2315
D) 2405
E) 2455

Answer & Explanation

  Option B
Pattern:
16 × 1 = 16
16 × 1.5 (1+0.5) = 24
24 × 2.5 (1.5+1) = 60
60 × 4.5 (2.5+2) = 270
270× 8.5 (4.5+4) = 2295

 

9. 95, 112, 78, 129, 61, ?
A) 146
B) 121
C) 164
D) 150
E) 184

Answer & Explanation

  Option A
Pattern:
95 + 1 × 17 = 112
112 – 2 × 17  = 78
78 + 3 × 17  = 129
129 – 4 × 17  = 61
61 + 5 × 17  = 146

 

10. 21, 10, 9, 12, 22, ?
A) 52.5
B) 71.5
C) 64.5
D) 80.5
E) 92.5

Answer & Explanation

 Option A
Pattern:
21 × 0.5 – 0.5  = 10
10 × 1 – 1  = 9
9 × 1.5 – 1.5  = 12
12 × 2 – 2  = 22
22 × 2.5 – 2.5  = 52.5

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