arithmetic sequences recursive and explicit

1

2

3

4

5

Explicit Formula for Arithmetic Sequences

Explicit Formula for Geometric Sequences

Recursive Formula for Arithmetic Sequences

Explicit Formula for Geometric Sequences

Arithmetic Sequence

Geometric Sequence

Neither

$$a\left(n\right)=-2n+25$$  

$$a\left(n\right)=-2n+21$$  

$$a\left(n\right)=23\cdot2^{n-1}$$  

$$a\left(n\right)=23\cdot2^{n-1}$$  

Explicit Formula for Arithmetic Sequences

Explicit Formula for Geometric Sequences

Recursive Formula for Arithmetic Sequences

Explicit Formula for Geometric Sequences

$$a\left(n\right)=-2n+25$$  

$$a\left(n\right)=-2n+21$$  

$$a\left(n\right)=23\cdot2^{n-1}$$  

$$a\left(n\right)=23\cdot2^{n-1}$$  

Arithmetic; common difference 4

Arithmetic; common difference -4

Geometric; common ratio 2

Geometric; common ratio 1/2

This is neither an arithmetic nor a geometric sequence.