Question

if thr common diffrence of an AP is 5 then what is T18-T13?

Answer 1

A + 17d -a - 12d
5d
25

Answer 2

Here is your solution

Given:-

Here ,
 t18 = a + 17d 
t13 = a + 12d 
D = 5
So ,

      t18 = a + 17(5) =  a + 85
      t13 = a + 12(5) = a + 60

A/q , 

d= 5

=t18 - t13

=t+17d - (t + 12d )

=t +17d -t -12d

=​17d - 12d

=d(17-12)

=5(5)

=25