If the nth term of the A.P. 9,7,5,... is same as the nth term of the A.P. 15,12,9,.. find `ndot`

Explanation

According to ,


`an=a+(n−1)d`

`∴9+(n−1)(−2)=15+(n−1)(−3)`

`⇒3n−3−2n+2=6`

`⇒n−1=6`

`n=7`