Directions (Qs. 1 - 25): Find the wrong term in the given series.
1. 10, 25, 75, 262.5, 1050, 4715
A) 75 B) 4715 C) 262.5 D) 1050
Sol: The series pattern is
(×2.5), (×3), (×3.5), (×4), (×4.5).
10 × 2.5 = 25
25 × 3 = 75
75 × 3.5 = 262.5
262.5 × 4 = 1050
1050 × 4.5 = 4725
Ans: B
2. 53, 37, 30, 25, 23, 22.
A) 25 B) 53 C) 30 D) 37
Sol: 53 − 16 = 37
37 − 8 = 29
29 − 4 = 25
25 − 2 = 23
23 − 1 = 22.
Ans: C
3. 6, 8, 19, 61, 250, 1251
A) 1251 B) 6 C) 250 D) 8
Sol: 6 × 1 + 2 = 8
8 × 2 + 3 = 19
19 × 3 + 4 = 61
61 × 4 + 5 = 249
249 × 5 + 6 = 1251.
Ans: C
4. 9, 24, 70, 204, 609, 1824
A) 204 B) 609 C) 9 D) 70
Sol: 9 × 3 − 3 = 24
24 × 3 − 3 = 69
69 × 3 − 3 = 204
204 × 3 − 3 = 609
609 × 3 − 3 = 1824
Ans: D
5. 13, 17, 26, 45, 67, 103
A) 17 B) 45 C) 67 D) 103
Sol: 13 + 22 = 17
17 + 32 = 26
26 + 42 = 42
42 + 52 = 67
67 + 62 = 103
Ans: B
6. 11, 22, 55, 165, 577, 2310
A) 165 B) 577 C) 2310 D) 11
Sol: 11 × 2 = 22
22 × 2.5 = 55
55 × 3 = 165
165 × 3.5 = 577.5
577.5 × 4 = 2310
Ans: B
7. 719, 841, 961, 1089, 1225, 1369
A) 1369 B) 841 C) 1089 D) 719
Sol: 272 = 729
292 = 841
312 = 961
332 = 1089
352 = 1225
372 = 1369
Ans: D
8. 13, 28, 58, 118, 248, 478
A) 58 B) 248 C) 478 D) 118
Sol: 13 × 2 + 2 = 28
28 × 2 + 2 = 58
58 × 2 + 2 = 118
118 × 2 + 2 = 238
238 × 2 + 2 = 478
Ans: B
9. 33, 38, 43, 51, 59, 65, 69, 77
A) 38 B) 51 C) 77 D) 65
Sol: 33 + 5 = 38
38 + 5 = 43
43 + 8 = 51
51 + 8 = 59
59 + 5 = 64
64 + 5 = 69
69 + 8 = 77
Ans: D
10. 5000, 995, 194, 34.8, 1.76, − 4.648
A) 1.76 B) 34.8 C) 194 D) − 4.648
Sol: 5000 ÷ 5 − 5 = 995
995 ÷ 5 − 5 = 194
194 ÷ 5 − 5 = 33.8
33.8 ÷ 5 − 5 = 1.76
1.76 ÷ 5 − 5 = −4.678
Ans: B
11. 9, 11, 25, 78, 321, 1611
A) 78 B) 1611 C) 321 D) 25
Sol: 9 × 1 + 2 = 11
11 × 2 + 3 = 25
25 × 3 + 4 = 79
79 × 4 + 5 = 321
321 × 5 + 6 = 1611
Ans: A
12. 13, 23, 43, 83, 163, 313
A) 43 B) 163 C) 83 D) 313
Sol: 13 × 2 − 3 = 23
23 × 2 − 3 = 43
43 × 2 − 3 = 83
83 × 2 − 3 = 163
163 × 2 − 3 = 323.
Ans: D
13. 13, 6, 5, 6, 9, 22.5
A) 9 B) 5 C) 22.5 D) 13
Sol: 13 × 0.5 − 0.5 = 6
6 × 1 − 1 = 5
5 × 1.5 − 1.5 = 6
6 × 2 − 2 = 10
10 × 2.5 − 2.5 = 22.5
Ans: A
14. 1400, 560, 224, 89.6, 35.94, 14.336.
A) 224 B) 89.6 C) 560 D) 35.94
Sol: 1400 ÷ 2.5 = 560
560 ÷ 2.5 = 224
224 ÷ 2.5 = 89.6
89.6 ÷ 2.5 = 35.84
35.84 ÷ 2.5 = 14.336
Ans: D
15. 24, 37, 48, 65, 80, 100
A) 100 B) 48 C) 24 D) 65
Sol: 52 − 1 = 24
62 + 1 = 37
72 − 1 = 48
82 + 1 = 65
92 − 1 = 80
102 + 1 = 101
Ans: A
16. 10, 9, 20, 56, 232, 1155
A) 232 B) 20 C) 56 D) 1155
Sol: 10 × 1 − 1 = 9
9 × 2 + 2 = 20
20 × 3 − 3 = 57
57 × 4 + 4 = 232
232 × 5 − 5 = 1155
Ans: C
17. 6, 10, 26, 62, 125, 226
A) 62 B) 10 C) 125 D) 226
Sol: 6 + 22 = 10
10 + 42 = 26
26 + 62 = 62
62 + 82 = 126
126 + 102 = 226
Ans: C
18. 224, 255, 289, 323, 360
A) 289 B) 323 C) 360 D) 224
Sol: 152 − 1 = 224
162 − 1 = 255
172 − 1 = 288
182 − 1 = 323
192 − 1 = 360
Ans: A
19. 13, 54, 218, 874, 4000, 13994
A) 874 B) 13994 C) 4000 D) 874
Sol: 13 × 4 + 2 = 54
54 × 4 + 2 = 218
218 × 4 + 2 = 874
874 × 4 + 2 = 3498
3498 × 4 + 2 = 13994
Ans: C
20. 6, 18, 72, 362, 2160, 15120
A) 15120 B) 2160 C) 362 D) 18
Sol: 6 × 3 = 18
18 × 4 = 72
72 × 5 = 360
360 × 6 = 2160
2160 × 7 = 15120
Ans: C
21. 20, 36, 72, 136, 236, 382
A) 136 B) 382 C) 236 D) 72
Sol: 20 + 42 = 36
36 + 62 = 72
72 + 82 = 136
136 + 102 = 236
236 + 122 = 380
Ans: B
22. 16, 17, 36, 110, 448, 2245
A) 448 B) 36 C) 110 D) 2245
Sol: 16 × 1 + 1 = 17
17 × 2 + 2 = 36
36 × 3 + 3 = 111
111 × 4 + 4 = 448
448 × 5 + 5 = 2245
Ans: C
23. 10, 15, 40, 165, 795, 3915
A) 15 B) 165 C) 3915 D) 795
Sol: 10 + 51 = 15
15 + 52 = 40
40 + 53 = 165
165 + 54 = 790
790 + 55 = 3915
Ans: D
24. 48, 80, 120, 168, 222, 288
A) 222 B) 120 C) 288 D) 168
Sol: 6 × 8 = 48
8 × 10 = 80
10 × 12 = 120
12 × 14 = 168
14 × 16 = 224
16 × 18 = 288
Ans: A
25. 32, 16, 16, 30, 48, 120
A) 32 B) 120 C) 48 D) 30
Sol: 32 × 0.5 = 16
16 × 1 = 16
16 × 1.5 = 24
24 × 2 = 48
48 × 2.5 = 120
Ans: D