Question

in an ap first term is equals to 4 and 9 th term is 20 then 15 th term is​

Answer 1

Answer:

Step-by-step explanation:lat the first term a be 4

As u know a9=a+8d

It's given that a9=20 so

A+8d=20

4+8d=20

8d=16

D=2

Substitute d =2

A+14d=15th term

4+28=32

Hence 32 is the 15th term