Question

the 8th term of an ap is zero prove that its 38 term is triple of its 18 term

Answer 1

i hope this will help u

Answer 2

a8=a+7d a38=3(a18) =a+37d=3(a+17d) =a= -7d put in a8 =a+7d =0 we get L.H.S.=R.H.S. ,hence proved