Directions (Q. 1-10): In each of the following number series, a wrong number is given. Find out that number

1. 1, 12, 31, 63, 101, 156, 227

A) 31

B) 63

C) 101

D) 156

E) 227

2. 4, 9, 28, 99, 415, 2105, 12660

A) 9

B) 28

C) 99

D) 415

E) 2105

3. 7, 26, 64, 124, 215, 342, 511

A) 26

B) 64

C) 124

D) 215

E) 342

4. 9, 28, 63, 120, 205, 323, 483

A) 28

B) 63

C) 120

D) 205

E) 323

5. 26, 57, 102, 164, 250, 366, 518

A) 57

B) 102

C) 164

D) 250

E) 366

6. 30, 210, 742, 1716, 3390, 5814

A) 210

B)742

C) 1716

D) 3390

E) 5814

7. 1440, 1152, 930, 766, 651, 580, 542

A) 930

B) 766

C) 651

D) 580

E) 542

8. 18, 59, 187, 576, 1749, 5269

A) 59

B) 187

C) 576

D) 1749

E) 5269

9. 7, 22, 64, 216, 898, 4525, 27190

A) 64

B) 216

C) 898

D) 4525

E) 27190

10. 16, 9278, 15109, 18484, 20212, 20941, 21157

A) 9278

B) 15109

C) 18484

D) 20212

5) 20941

Answers :

1-B

The number should be 60.

+ 3^{2} + 2, +4^{2} + 3, + 5^{2} + 4 ...

2. D; The number should be 416. × 1 + 5, × 2 + 10, × 3 + 15, × 4 + 20 ...

3. B; The number should be 63. (1 × 2 × 3) + 1, (2 × 3 × 4) + 2, (3 × 4 × 5) + 3 ...

4. E; The number should be 324. 1 × 2^{2 }+ 5, 2 × 3^{2} + 10, 3 × 4^{2 }+ 15, 4 × 5^{2 }+ 20 ...

5. A; The number should be 58. 1^{3} + 25, 2^{3} + 50, 3^{3 }+ 75, 4^{3} + 100 ...

6. B; The number should be 738. 3^{3 }+ 3, 6^{3} – 6, 9^{3} + 9, 12^{3} – 12...

7. C; The number should be 652. 1440, 1440 – (17)^{2} + 1, 1440 – (15)^{2} + 3, 1440 – (13)^{2} + 5,1440 – (11)^{2} + 7

8. D; The number should be 1748. × 3 + 5, × 3 + 10, × 3 + 15

9. B; The number should be 217. × 1 + 15, × 2 + 20, × 3 + 25, × 4 + 30

10. 1; The number should be 9277. +(21)^{3} , +(18)^{3} , +(15)^{3}