Number Series -1

Find the next number in the series 
1. 8, 15, 22,___,36
a] 5
b] 7
c] 29
d] 14

2. 0,___,12, 28
a] 4 
b] 2
c] 6
d] 8

3. 13, 25, ___, 61
a] 30
b] 35
c] 40
d] 41

4. 7, 10, 15, ____
a] 20
b] 24
c] 22
d] 21

5. 25, 49, 121, ____
a] 160
b] 179
c] 169
d] 134

6. 48, 36, 27, 18, ___
a] 8
b]9
c]7
d]6

7. 24, -12, -21, __
a] 30
b]-30
c] -28
d] 28

8. 10, 14, 20, ___
a] 28
b] 26
c] 30
d] 45

9. 8, 14, 20, ___
a] 23
b] 26
c] 28
d] 30

10. 11, 2, 22, 4, 44, ___ 
a] 8
b] 11
c] 16
d] 10

ANSWERS

1. c [+7]
2. a [ 2*2 - 4 = 4-4=0; 2*2*2-4 = 8-4 = 4]
3. d [ 2*2+3*3=4+9=13; 3*3+4*4=9+16=25]
4. d [5+2=7;7+3=10;10+5=15]
5. c [5*5; 7*7; 11*11]
6. b [4+8=12, 48-12=36; 3+6=9, 36-9=27]
7. b [ 2+4=6, 24-6*6=24-36= -12]
8. a [ 10+4=14; 14+6=20; 4,6,8,10,.....series]
9. b [ 3+5=8; 4+10=14; 5+15=20 series]
10. a [ 1+1=2; 2+2=4; 4+4=8 ]