Question

find a20, the 20th term, of the arithmetic sequence 1, 3, 5, 7, 9, …

Answer 1

a=1
common difference d=3-1=2
nth term= a+(n-1)d
2oth term= 1+(20-1)2
=1+38
=39

Answer 2

Answer:

The answer is 39.

Step-by-step explanation:

The first term of arithmetic sequence is 1:

$a_{1}=1$

and the formula of arithmetic sequence is:

$a_{n}=2*n-1$

20th term of the arithmetic sequence will be:

$a_{20}=2*20-1=39$