Question

Diffrence between 5 th and a th term of an Arithmetic sequence is 20 what is the difference between the 3th and the 1 st term

Answer 1

Answer:

10

Step-by-step explanation:

5th - ath = 20

find the difference between

3th - a =?

solution

a+4d -a = 20

4d = 20

d = 20/4

d = 5

3th -ath =?

a+2d - a = ?

2d= 2 x 5

= 10