Question

if 10th term of ap is 9 and 9th term is 10 then find it's common difference​

Answer 1

Step-by-step explanation:

Given: In an AP:

A10=9 => a+9d=9.---(1)

A9=10 => a+8d=10---(2)

To find: Common difference, c.d.

By (2)-(1(, we get:

=> a+8d-(a+9d)=10-9

=> a+8d-a-9d=1

=> -1d=1

d=-1.