AAO ExamCT 2: Quant (Number Series)
AAO ExamCT 2 Quant (Number Series)
1. What should come in place of the question mark '?' in the following number series? 126, 147, 168, ?, 210, 231

178

196

190

175
Calculation∶
The series follows following pattern
147  126 = 21
168  147 = 21
189  168 = 21
210  189 = 21
231  210 = 21 ∴ The value of ? is 189
2. What should come in place of the question mark '?' in the following number series? 17, 90, 273, 274, 275, 822, ?

3125

3125

4115

4225
Calculation∶
The series follows following pattern
17 × 5 + 5 = 90
90 × 3 + 3 = 273
273 × 1 + 1 = 274
274 × (1)  1 = 275
275 × (3)  3 = 822
822 × (5)  5 = 4115 ∴ The value of ? is 4115
3. What should come in place of the question mark '?' in the following number series? 3, 2, 6, 15, ?, 315

62

63

65

60
Calculation∶
The series follows following pattern
⇒ 3 × (1) + 1 = 2
⇒ 2 × (2) + 2 = 6
⇒ 6 × (3) + 3 = 15
⇒ 15 × (4) + 4 = 64
⇒ 64 × (5) + 5 = 315
∴ The value of ? is 64
4. What should come in place of the question mark '?' in the following number series? 3, 7, 15, ?, 43, 63

32

25

36

21
Calculation∶
The series follows following pattern
3 + (1 × 4) = 7
7 + (2 × 4) = 15
15 + (3 × 4) = 27
27 + (4 × 4) = 43
43 + (5 × 4) = 63
∴ The value of ? is 27
5. What should come in place of the question mark ‘?’ in the following number series?
17, 19, 40, 122, ?, 2452

500

530

570

None of these
Calculation:
The series follows the following pattern
17 × 1 + 2 = 19
19 × 2 + 2 = 40
40 × 3 + 2 = 122
122 × 4 + 2 = 490
490 × 5 + 2 = 2452
∴ The missing number is 490.
6. In each of the following number series, the wrong number is given, find out that number.
3, 7, 22, 70, 206, 537

3

7

206

537
The series follows the following pattern
3
⇒ 3 + 1^{3} + 3 = 7
⇒ 7 + 2^{3} + 7 = 22
⇒ 22 + 3^{3} + 22 = 71
⇒ 71 + 4^{3} + 71 = 206
⇒ 206 + 5^{3} + 206 = 537
∴ the wrong number in the series is 70
7. In each of the following number series, the wrong number is given, find out that number.
22, 21, 41, 128, 513, 2564

128

513

2564

21
The series follows the following pattern:
22 × 1  1 = 21
21 × 2 + 1 = 43
43 × 3  1 = 128
128 × 4 + 1 = 513
513 × 5  1 = 2564
∴ The wrong term in the series is 41.
8. In each of the following number series, the wrong number is given, find out that number.
1440, 240, 48, 16, 4, 2

240

2

4

48
The series follows the following pattern:
1440 ÷ 6 = 240
240 ÷ 5 = 48
48 ÷ 4 = 12
12 ÷ 3 = 4
4 ÷ 2 = 2
∴ The wrong term in the series is 16.
9. In each of the following number series, the wrong number is given, find out that number.
35, 50, 63, 80, 99, 122

63

122

99

50
The series follows the following pattern:
6^{2} – 1 = 35
7^{2} + 1 = 50
82 – 1 = 63
92 + 1 = 82
102 – 1 = 99
112 + 1 = 122
∴ The wrong term in the series is 80.
10. In each of the following number series, a wrong number is given. Find out that number.
24, 47, 45, 91, 90, 179

91

47

179

90
The series follows the following pattern:
24 × 2  1 = 47
47 × 1  1 = 46
46 × 2  1 = 91
91 × 1  1 = 90
90 × 2  1 = 179
∴ The wrong term in the series is 45.
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