**Directions (1 – 5): What will come in place of the question mark (?) in the following number series ?**

**1. 9 15 27 51 99 ?**

(1) 165

(2) 195

(3) 180

(4) 190

(5) None of these

View Solution

Explanation

1. (2) The pattern of the number series is :9 × 2 – 3 = 18 – 3 = 15

15 × 2 – 3 = 30 – 3 = 27

27 × 2 – 3 = 54 – 3 = 51

51 × 2 – 3 = 102 – 3 = 99

99 × 2 – 3 = 198 – 3 = 195

**2. 13 21 36 58 87 ?**

(1) 122

(2) 128

(3) 133

(4) 123

(5) None of these

View Solution

Explanation

2. (4) The pattern of the number series is :13 + 8 = 21

21 + 8 + 7 = 21 + 15 = 36

36 + 15 + 7 = 36 + 22 = 58

58 + 22 + 7 = 58 + 29 = 87

87 + 29 + 7 = 87 + 36 = 123

**3. 7 9 19 45 95 ?**

(1) 150

(2) 160

(3) 145

(4) 177

(5) None of these

View Solution

Explanation

3. (4) The pattern of the number series is :7 + 2 + 0 = 9

9 + (2 + 8) = 19

19 + (10 + 16) = 45

45 + (26 + 24) = 95

95 + (50 + 32) = 177

**4. 14 15 23 32 96 ?**

(1) 121

(2) 124

(3) 152

(4) 111

(5) None of these

View Solution

Explanation

4. (1) The pattern of the number series is :14 + 1² = 15

15 + 2³ = 23

23 + 3² = 32

32 + 4³ = 96

96 + 5² = 96 + 25 = 121

**5. 20 24 36 56 84 ?**

(1) 116

(2) 124

(3) 120

(4) 128

(5) None of these

View Solution

Explanation

5. (3) The pattern of the number series is :20 + 1 × 4 = 20 + 4 = 24

24 + 3 × 4 = 24 + 12 = 36

36 + 5 × 4 = 36 + 20 = 56

56 + 7 × 4 = 56 + 28 = 84

84 + 9 × 4 = 84 + 36 = 120

**Directions (6 – 10) : What should come in place of the question mark (?) In the following number series ?**

**6. 3 732 1244 1587 1803 1928 ?**

(1) 2144

(2) 1992

(3) 1955

(4) 2053

(5) None of these

View Solution

Explanation

6. (2) The pattern of the number series is :732 – 3 = 729 = 9³

1244 – 732 = 512 = 8³

1587 – 1244 = 343 = 7³

1803 – 1587 = 216 = 6³

1928 – 1803 = 125 = 5³

? = 1928 + 4³ = 1928 + 64 = 1992

**7. 16 24 ? 210 945 5197.5 33783.75**

(1) 40

(2) 36

(3) 58

(4) 60

(5) None of these

View Solution

Explanation

7. (4) The pattern of the number series is :16 × 1.5 = 24

24 × 2.5 = 60

60 × 3.5 = 210

210 × 4.5 = 945

**8. 45030 9000 1795 355 68 ? 1.32**

(1) 11.6

(2) 12.2

(3) 10.4

(4) 9.8

(5) None of these

View Solution

Explanation

8. (1) The pattern of the number series is :(45030 ÷ 5) – 6 = 9000

(9000 ÷ 5) – 5 = 1795

(1795 ÷ 51 – 4 = 355

(355 ÷ 5) – 3 = 68

(68 ÷ 5) – 2 = 13.6 – 2 = 11.6

**9. 5 12 36 123 ? 2555 15342**

(1) 508

(2) 381

(3) 504

(4) 635

(5) None of these

View Solution

Explanation

9. (1) The pattern of the number series is :5 × 1 + 1 × 7 = 12

12 × 2 + 2 × 6 = 36

36 × 3 + 3 × 5 = 123

123 × 4 + 4 × 4 = 492 + 16 = 508

508 × 5 + 5 × 3 = 2540 + 15 = 2555

**10. 8 11 17 ? 65 165.5 498.5**

(1) 27.5

(2) 32

(3) 28

(4) 30.5

(5) None of these

View Solution

Explanation

10. (4) The pattern of the number series is :8 × 0.5 + 7 = 4 + 7 =11

11 × 1 + 6 = 17

17 × 1.5 + 5 = 25.5 + 5 = 30.5

30.5 × 2 + 4 = 61 + 4 = 65

**Directions (11- 15) :What will come in place of the question mark (?) in the following number series ?**

**11. 117 389 525 593 627 (?)**

(1) 654

(2) 640

(3) 634

(4) 630

(5) None of these

View Solution

Explanation

11. (5) The pattern of the number series is :389 – 117 = 272

525 – 389 = 136

593 – 525 = 68

627 – 593 = 34

? = 627 + 17 = 644

**12. 7 11 23 51 103 (?)**

(1) 186

(2) 188

(3) 185

(4) 187

(5) None of these

View Solution

Explanation

12. (4) The pattern of the number series is :7 + 1 × 4 = 11

11 + (1 + 2) 4 = 11 + 3 × 4 = 23

23 + (3 + 4) 4 = 23 + 7 × 4 = 51

51 + (7 + 6) 4 = 51 + 13 × 4 = 103

103 + (13 + 8) 4 = 103 + 21 × 4 = 187

**13. 18 27 49 84 132 (?)**

(1) 190

(2) 183

(3) 180

(4) 193

(5) None of these

View Solution

Explanation

13. (4) The pattern of the number series is :18 + 9 = 27

27 + (9 + 13) = 49

49 + (9 + 26) = 84

84 + (9 + 39) = 132

**14. 33 43 65 99 145 (?)**

(1) 201

(2) 203

(3) 205

(4) 211

(5) None of these

View Solution

Explanation

14. (2) The pattern of the number series is :33 + 10 = 43

43 + (10 + 12) = 65

65 + (10 + 24) = 99

99 + (10 + 36) = 145

145 + (10 + 48) = 203

**15. 655 439 314 250 223 (?)**

(1) 205

(2) 210

(3) 195

(4) 190

(5) None of these

View Solution

Explanation

15. (5) The pattern of the number series is :655 – 439 = 216 = 6³

439 – 314 = 125 = 5³

314 – 250 = 64 = 4³

250 – 223 = 27 – 3³

? = 223 – 2³ = 223 – 8 = 215