Question

if 7 times the 7th term of an ap is equal to 11 times its 11th term then find its 18th term​

Answer 1

Answer:

given:

7(a7)=11(a11)

7(a+6d)=11(a+10d)

7a+42d=11a+110d

-4a=68d

a=-68d/4

a18=a+17d

=(-68d/4) + 17d

=(-68d+68d)/4

=0/4

=0

hope it helps u....^_^