Question

determine ap whose 4th term is 18 and the difference of the 9th term from the 5th term is 30​

Answer 1

Answer:

It is given that 4th term is 18.

a4= 18

a + 3d = 18

a = 18 - 3d  ... (1)

Also, a15- a9= a+14d - 1 - 8d = 30

6d = 30

d = 5

Thus, from (1), we get,

a = 18 - 15 = 3

Therefore, the AP is:

3,8,13,18,23 ......