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:
