Question

Make up an arithmetic sequence. Give it to a friend and ask for its twentieth term.

Short answer

Twentieth term is 43

Step-by-step solution

Given Information 

Make up an arithmetic sequence. Give it to a friend and ask for its twentieth term.

Assume an Arithmetic sequence. 

Lets assume an arithmetic sequence. 5,7,9,11......

First term is 5

difference between the terms is 2

find out 20th term

find out 20th term 

Use nth term formula

$$\begin{gathered} a_n=a_1+(n-1)d \\ n=20,a_1=5 \\ d=2 \\ {a}_{20}=5+(20-1)2 \\ {a}_{20}=5+(20-1)2 \\ {a}_{20}=43 \end{gathered}$$