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1. (4) The series is based on the following pattern:
11 = 2 × 3 + 5
38 = 11 × 4 – 6
197 = 38 × 5 + 7
1172 not equal to 197 × 6 – 8
1172 is wrong and it should be replaced by 197 × 6 – 8 = 1174

2. (1) The series is based on the following pattern:
107 – 71 = 36 = 6^2
71 – 46 = 25 = 5^2
46 – 30 = 16 = 4^2
30 – 21 = 9 = 3^2
21 – 19 = 2 not equal to 2^2
19 should be replaced by 17 for which 21 – 17 = 22

3. (4) The series is based on the following pattern:
16 = 9 + 7
25 = 16 + 9
41 = 25 + 16
68 not equal to 41 + 25

4.(3)The series is based on the following pattern:

4 x 0.5 = 2
2 x 1.5 = 3(3.5 given here)
3 x 2.5 = 7.5
and so on
3 should be replaced by 3.5

5.(3)The series is based on the following pattern:
16 x 0.25 = 4
4 x 0.5 = 2
2 x 0.75 = 1.5
1.5 x 1 = 1.5( 1.75 given here)
and so on
1.75 should be replaced by 1.5

6. (3) The pattern is :
150 × 2 – 1 × 10
= 300 – 10 = 290
290 × 2 – 2 × 10
= 580 – 20 = 560
560 × 2 – 3 × 10 = 1120 – 30
= 1090 not equal to 1120
1090 × 2 – 4 × 10 = 2180 – 40 = 2140
2140 × 2 – 5 × 10 = 4280 – 50 = 4230

7. (2) The pattern is :
10 × 1 – 2 = 8
8 × 2 – 3 = 13
13 × 3 – 4 = 35
35 × 4 – 5 = 135
135 × 5 – 6 = 675 – 6 = 669 not equal to 671
669 × 6 – 7 = 4014 – 7 = 4007

8. (3) The pattern is :
(80/2) + 2 = 40 + 2 = 42
(42/2) + 2 = 21 + 2 = 23 not equal to 24
(23/2) + 2 = 11.5 + 2 = 13.5
(13.5/2) + 2 = 6.75 + 2 = 8.75
(8.75/2) + 2 = 4.375 + 2 = 6.375

9. (1) The pattern is:
125 x 3/5 = 75
75 x 3/5 = 45
45 x 3/5 = 27 not equal to 25
27 x 3/5 = 16.2
16.2 x 3/5 = 9.72

10. (5) The pattern is :
29 + 1 × 8 = 37
37 – 2 × 8 = 37 – 16 = 21
21 + 3 × 8 = 21 + 24 = 45 not equal to 43
45 – 4 × 8 = 45 – 32 = 13
13 + 5 × 8 = 13 + 40 = 53
53 – 6 × 8 = 53 – 48 = 5

11. (3) The pattern is:
13 + 12 = 25 ;
25 + 15 = 40
40 + 18 = 58 not equal to 57
58 + 21 = 79

12. (1) The pattern is :
850 – 200 = 650 not equal to 600
650 – 100 = 550
550 – 50 = 500
500 – 25 = 475
475 – 12.5 = 462.5

13. (4) The pattern is: 2 × 3 = 6 not equal to 10
6 × 3 = 18 ;
18 × 3 = 54
54 × 3 = 162

14. (3) The pattern is:
8 + 4 × 1 = 12;
12 + 4 × 3 = 24
24 + 4 × 5 = 44 not equal to 46
44 + 4 × 7 = 72
72 + 4 × 9 = 108

15. (1) The pattern is :
142 – 23 = 119 ;
119 – 19 = 100
100- 17 = 83
83 – 13 = 70 not equal to 65
70 – 11 = 59
59 – 7 = 52

 

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