## Number Series Questions and Answers Part-10

1. What will come at the place of question mark ?
1, 9, 25, 49, ?, 121.
a) 100
b) 91
c) 64
d) 81

Explanation:

12 = 1.
32 = 9.
52 = 25.
72 = 49.
92 = 81.
112 = 121.

2. What will come at the place of question mark?
4, 7, 12, 19, 28, ?
a) 49
b) 36
c) 30
d) 39

Explanation: First term : 4
Second term: 4+3 = 7
Third term : 7+5 = 12
Fourth term : 12+7 = 19.
Fifth term : 19+9 = 28.
Therefore,
Next Terms : 28+11 = 39

3. What will come at the place of question mark ?
6, 11, 21, 36, 56, ?
a) 91
b) 51
c) 81
d) 42

Explanation:

6 (+5)→ 11 (+10)→ 21 (+15)→ 36 (+20)→ 56 (+25) → 81.

4. What will come at the place of question mark ?
10, 100, 200, 310, ?
a) 430
b) 420
c) 410
d) 400

Explanation:

1st term : 10
2nd term : 100 = 10+90
3rd term : 200 = 100+100
4th term : 310 = 200+110
5th Term: 430 = 310+120

5. What will come at the place of question mark ?
8, 28, 116, 584, ?
a) 1752
b) 3504
c) 3508
d) 3502

Explanation: (8 *3) + 4 = 28 (28 *4) + 4 = 116 (116 *5) + 4 = 584 (584 *6) + 4 = 3508.

6. What will come at the place of question mark ?
2816, ? , 176, 44, 11.
a) 704
b) 1408
c) 352
d) 2640

Explanation:

Logic: Next term = Previous term /4
2816 /4 = 704
704 /4 = 176.
176 /4 = 44.
44 /4 = 11.

7. What will come at the place of question mark ?
113, 225, 449, ? , 1793
a) 897
b) 789
c) 987
d) 978

Explanation:

113
113 * 2 = 226 -1 = 225
225 * 2 = 450 -1 = 449
449 * 2 = 898 - 1 = 897
897 * 2 = 1794 -1 = 1793

8. Which of the following will come in place of the question mark (?) in the following sequence?

PRODUCTIVITY, RODUCTIVIT, ODUCTIVI, ?
a) DUCTIV
b) DUCTLY
c) UCTIV
d) DUCTI

Explanation:

PRODUCTIVITY = RODUCTIVIT.(First and last letters are removed.)

RODUCTIVIT = ODUCTIVI.

ODUCTIVI = DUCTIV.

9. What will come at the place of question mark ?
6, 24, 60,120, 210, ?
a) 336
b) 366
c) 330
d) 660

Explanation:

First Number = 1 *2 *3 = 6
Second Number = 2*3*4 = 24
Third Number = 3*4*5 = 60
Fourth Number = 4*5*6 = 120
Fifth Number = 5*6*7 = 210
Sixth Number = 6*7*8 = 336.

Alternatively,

2*2*2-2=6
3*3*3-3=24
4*4*4-4=60
5*5*5-5=120
6*6*6-6=210
7*7*7-7=336.

10. What will come at the place of question mark ?
6, 11, 31, 121, 601, ?
a) 3600
b) 3621
c) 3601
d) 3611

Explanation:

Logic:
First Term = 6.

Second term = 6*2 -1 = 11.

Third term = 11* 3 - 2 = 31.

Fourth term = 31 *4 - 3 = 124 -3 = 121.

Fifth term = 121*5 - 4 = 601.

Sixth term = 601 *6 = 3606 - 5 = 3601.