__Quantitative Aptitude Number Series Questions (13 – 09 – 2017)__**Directions (1 – 5): What will come in place of question mark (?) in the following number series.**

**1. 3 11 ? 115 567 3411**

a) 25

b) 27

c) 42

d) 37

**2. 326.34375 219.0625 90.125 29.25 11 ?**

a) 9

b) 8

c) 5.5

d) 7.5

e) 6.5

**3. 5 4 23 7 3 24 9 2 ? 11 1 14**

a) 29

b) 31

c) 20

d) 21

e) 25

**4. 19 35 89 217 ? 899**

a) 429

b) 431

c) 420

d) 421

e) 467

**5. 19 29 47 77 125 ?**

a) 235

b) 283

c) 200

d) 220

e) 225

**Direction (6 – 10): In the following number series only one number is wrong. Find out the wrong number.**

**6. 8 4 4 6 12 28 90**

a) 12

b) 90

c) 28

d) 6

e) None of
these

**7. 17 17.25 18.25 20.75 24.5 30.75**

a) 30.75

b) 20.75

c) 17.25

d) 24.50

e) None of
these

**8. 438 487 447 476 460 469**

a) 447

b) 469

c) 460

d) 476

e) None of
these

**9. 2 7 18 45 99 209 431**

a) 18

b) 45

c) 431

d) 99

e) None of
these

**10. 6 8 10 42 146 770 4578**

a) 4578

b) 770

c) 42

d) 146

e) None of
these

**Directions (11 – 15): In the following number series, only one number is wrong. If the wrong number is corrected, the series gets established following a certain logic. Below the series a number is given followed by (a), (b), (c), (d), (e) and (f). You have to complete the series following the same logic as in the given series after correcting the wrong number. What should come at the place of (e) in the following question?**

**11.**

**20 32 47 63 80 90**

**35 (a) (b) (c) (d) (e)**

a) 105

b) 175

c) 125

d) 100

e) 143

**12.**

**25 47 89 158 272 440**

**60 (a) (b) (c) (d) (e)**

a) 970

b) 475

c) 525

d) 376

e) None of
these

**13.**

**21 24 87 122 650 732**

**15 (a) (b) (c) (d) (e)**

a) 650

b) 450

c) 627

d) 545

e) None of
these.

**14.**

**27 53 87 129 179 237**

**123 (a) (b) (c) (d) (e)**

a) 482

b) 287

c) 340

d) 453

e) None of
these

**15.**

**16 79 318 925 1906 1901**

**28 (a) (b) (c) (d) (e)**

a) 3355

b) 3346

c) 3250

d) 3145

e) 3450

**Solutions:**

**1. B)**The number series is as follows:

3
× 2 + 5 = 11

11
× 3 – 6 =

**27**
27
× 4 + 7 = 115

115
× 5 – 8 = 567

567
× 6 + 9 = 3411

**2. D)**The number series is as follows:

326.34375
÷ 1.5 + 1.5 = 219.0625

219.0625
÷ 2.5 + 2.5 = 90.125

90.125
÷ 3.5 + 3.5 = 29.25

29.25
÷ 4.5 + 4.5 = 11

11
÷ 5.5 + 5.5 =

**7.5****3. D)**The number series is as follows:

5
× 4 + 3 = 23

7
× 3 + 3 = 24

9
× 2 + 3 =

**21**
11
× 1 + 3 = 14

**4. E)**The number series is as follows :

19
+ 2 × 2^3 = 35

35
+ 2 × 3^3 = 89

89
+ 2 × 4^3 = 217

217
+ 2 × 5^3 =

**467**
467
+ 2 × 6^3 = 899

**5. C)**The series follows the triple difference

19 29 47 77 125 200

10
18 30 48 75

8 12 18 27

×1.5 ×1.5 ×1.5

**6. C)**The no. series is based on the following pattern:

8
× 0.5 = 4;

4
× 1 = 4;

4
× 1.5 = 6;

6
× 2 = 12;

12
× 2.5 = 30 ≠ 28;

30
× 3 = 90

**7. B)**The number series is based on following pattern:

17
+ 0.25 × (1)^2 = 17.25

17.25
+ 0.25 × (2)^2 = 18.25

18.25
+ 0.25 × (3)^2 =

**20.50**≠ 20.75
20.50
+ 0.25 × (4)^2 = 24.50

24.50
+ 0.25 × (5)^2 = 30.75

**8. A)**The number series is based on following pattern:

438
+ (7)^2 = 487

487
– (6)^2 =

**451 ≠**447
451
+ (5)^2 = 476

476
– (4)^2 = 460

460
+ (3)^2 = 469

**9. E)**The number series is based on following pattern:

2
× 2 + 3 = 7

7
× 2 + 5 =

**19**≠ 18
19
× 2 + 7 = 45

45
× 2 + 9 = 99

99
× 2 + 11 = 209

209
× 2 + 13 = 431

**10. D)**The number series is based on following pattern:

6
× 1 + 1 × 2 = 8

8
× 2 – 2 × 3 = 10

10
× 3 + 3 × 4 = 42

42
× 4 – 4 × 5 =

**148**≠ 146
148
× 5 + 5 × 6 = 770

770
× 6 – 6 × 7 = 4578

**11. A)**The number series is as follows:

20;

20
+ 12 (6 × 2) = 32;

32
+ 15 (5 × 3) = 47;

47
+ 16 (4 × 4) = 63;

63
+ 15 (3 × 5) = 78 ≠ 80;

78
+ 12 (2 × 6) = 90

In
the same pattern as above the second series obtains 105 in place of (e).

**12. B)**The series is as follows: Triple difference

25 47 89 158 272 440

+22 +42 +69 +110 +172

+20 +27 +41 +62

+7 +14 +21

With
the above pattern it is clear that in place of 272 we should place 268

So
following the above pattern in the second series also we get 475 in place of
(e).

**13. C)**The number series is as follows:

**14. D)**The number series is as follows:

**15. B)**The number series is as follows: