2, 3, 5, 8, 12, ...

5, 10, 15, 20, 25, ...

1, 2, 4, 8, 16, ...

0, 2, 6, 12, 20, ...

1, 5, 25, 125, ...

0, 5, 10, 15, ...

2, 4, 6, 8, ...

81, 61, 41, 21, ...

$$a_n=a_1\left(n-1\right)d$$

$$a_n=a_1+\left(n-1\right)d$$

$$a_n=a_1r^{n-1}$$

$$a_n=a_1+r^{n-1}$$

15

17

192

384

27

26

25

24

0.1 , 0.2 , 0.3 ,...

2 , 4 , 6 , ...

$$\frac{3}{2},\frac{1}{2},-\frac{1}{2},...$$

$$\frac{4}{3},\frac{4}{6},\frac{4}{12},...$$

1

4

8

16

16

-16

32

-32

$$a_n=a_1\left(n-1\right)d$$

$$a_n=a_1+\left(n-1\right)d$$

$$a_n=a_1r^{n-1}$$

$$a_n=a_1+r^{n-1}$$