If the seventh term of an AP is equal to 11times the eleventh term.find the 18th term of the Ap, given that the common difference is 5.

Answer 1

"seventh term of an AP is equal to 11times the eleventh term"
a + 6d = 11(a + 10d)
a + 6d = 11a + 110d
10a = -104d

but d = 5, so
10a = -520
a = -52

term(18) = a + 17d = ....