18. The 8th term of an A. P. is zero. Prove that 38th term is triple of its 18th term.
34.The 24th term of an AP is twice its 10th term. Show that its 72nd term is the 4 times its 15th term
18. The 8th term of an A. P. is zero. Prove that 38th term is triple of its 18th term.