# Quantitative Aptitude: Number Series Set 101

Directions(1-5): Find the missing term ‘?’ of the following series.

1. 3, 4, 9, 28, ?, 566
124
100
115
127
113
Option E
*1+1
*2+1
*3+1
*4+1
*5+1
? = 113

2. 418, 208, 102, 48, ?, 5
10
15
25
20
30
Option D
*2+2
*2+4
*2+6
*2+8
*2+10
? = 20

3. 180, 191, 193, 203, 206, ?
200
215
226
212
202
Option B
+11,+2,+10,+3,+9
? = 215

4. 153, 155, 160, 170, 187, ?
213
200
218
225
220
Option A
Double difference
? = 213

5. 3, 1.5, 1.5, 3, 12, 96, ?
1551
1536
1524
1550
1500
Option B
*0.5,*1,*2,*4, *8, *16
? = 1536

6. Directions(6-10):
Find the wrong number of the following series.

7. 957, 597, 360, 237, 123, 110, 9
597
123
110
9
360
Option C
Wrong number = 110
957 – 597 = 360
597 – 360 = 237
360 – 237 = 123
237 – 123 = 114
123 – 114 = 9
There should be 114 in place of 110.

8. 19, 380, 669, 840, 959, 1008, 1033
19
380
840
959
1033
Option
Wrong number = 840
19 + (19)² = 19 + 361 = 380
380 + (17)² = 380 + 289 = 669
669 + (13)² = 669 + 169 = 838
838 + (11)² = 838 + 121 = 959
959 + (7)² = 959 + 49 = 1008
1008 + (5)² = 1008 + 25 = 1033
There should be 838 in place of 840.

9. 1487, 1170, 928, 803, 739, 712, 704
1170
739
704
803
928
Option A
Wrong number = 1170
1487 – (7)³ = 1487 – 343 = 1144
1144 – (6)³ = 1144 – 216 = 928
928 – (5)³ = 928 – 125 = 803
803 – (4)³ = 803 – 64 = 739
739 – (3)³ = 739 – 27 = 712
712 – (2)³ = 712 – 8 = 704
There should be 1144 in place of 1170.

10. 6, 18, 36, 144, 720, 4320, 30240
720
6
4320
18
36
Option D
Wrong number = 18
6 × 2 = 12
12 × 3 = 36
36 × 4 = 144
144 × 5 = 720
720 × 6 = 4320
4320 × 7 = 30240
There should be 12 in place of 18.

11. 1764, 1681, 1597, 1521, 1444, 1369, 1296
1764
1444
1597
1369
1296
Option C
Wrong number = 1597
1764 – 83 = 1681
1681 – 81 = 1600
1600 – 79 = 1521
1521 – 77 = 1444
1444 – 75 = 1369
1369 – 73 = 1296
There should be 1600 in place of 1597.