# Quantitative Aptitude: Number Series Set 149

1. 4 2 3 7.5 ? 118.125
26.25
38.75
42.25
28.75
none of these
Option A
Series Pattern Given Series
4 4
4 × 0.5 = 2 2
2 × 1.5 = 3 3
3 × 2.5 = 7.5 7.5
7.5 × 3.5 = 26.25 26.25 ✓
26.25 × 4.5 = 118.125 118.125

Hence, option (A) is correct.

2. 256 252 279 263 388 ?
341
352
323
336
none of these
Option B

Series Pattern Given Series
256 256
256 – 22 = 252 252
252 + 33 = 279 279
279 – 42 = 263 263
263 + 53 = 388 388
388 – 62 = 352 352 ✓

Hence, option (B) is correct.

3. 188 269 333 382 418 ?
181
126
443
315
none of these
Option C
Series Pattern Given Series
188 188
188 + (9)2 = 269 269
269 + (8)2 = 333 333
333 + (7)2 = 382 382
382 + (6)2 = 418 418
418 + (5)2 = 443 443 ✓

Hence, option (C) is correct.

4. 420, 462, 506, 552, 600, ?
725
800
350
650
675
Option D
20*21=420
21*22=462
22*23=506
23*24=552
24*25=600
25*26=650
Hence, option (D) is correct.

5. 40 44 97 307 1253 ?
6301
6201
6401
6403
6501
Option A
Correct Option: A
The series is × 1 + 2*2, × 2 + 3*3, × 3 + 4*4, × 4 + 5*5, × 5 + 6*6, × 6 + 7*7

6. 129 163 202 246 ? 349
265
285
295
275
None of these
Option C
Correct Option: C
The series is + (5 × 7) – 1, + (5 × 8) – 1, + (5 × 9) – 1, + (5 × 10) – 1, + (5 × 11) – 1, ….

7. 3 13 39 89 ? 293
172
171
174
181
183
Option B
Series Pattern Given Series
3 3
3 + (32 + 1) = 13 13
13 + (52 + 1) = 39 39
39 + (72 + 1) = 89 89
89 + (92 + 1) = 171 171 ✓
171 + (112 + 1) = 293 293
Hence, option B is correct.

8. 3, 2, 3, 6, ?, 37.5, 115.5
11
14
16
18
none of these
Option B
Correct Option: B
The series is ×0.5+0.5, ×1+1, ×1.5+1.5, *2+2, *2.5+2.5….

9. 567 126 36 14.4 9.6 ?
16.5
17.9
18.1
12.6
none of these
Option E
Correct Option: E
Series Pattern Series
567 567
567 ÷ 4.5 126
126 ÷ 3.5 36
36 ÷ 2.5 14.4
14.4 ÷ 1.5 9.6
9.6 ÷ .5 19.2 ✓

10. 441 428 407 370 ? 168
288
291
301
311
245
Option C
Correct Option: C
Series I : 441 428 407 370 ? 168
Sereis II : –13 –21 –37 ? ?
Series III : 8 16 32 ?
Series IV ×2 ×2 ×2
Clearly, the pattern in series IV is multiplication of 2.

So, the missing term in series III = 32 × 2 = 64

∴ missing term in series II = – 37 – 32 = – 69, – 69 – 64 = – 133
∴ missing term in series I = 370 – 69 = 301

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