Solve the following subquestions. (Any one)1) The 6h term of an A.P is

1.	Solve the following subquestions. (Any one)1) The 6h term of an A.P is zero. Prove that its 21t term is triple its11h term.
Answer» First term = aCommon diff. = d6th term = a + 5da + 5d = 0 a = -5d 21st term = a + 20d = -5d + 20d = 15d11th term = a + 10d = -5d + 10d = 5d Therefore,21st term = 3 * 11th term = 3 * 5d = 15d (proved)

Solve the following subquestions. (Any one)1) The 6h term of an A.P is zero. Prove that its 21t term is triple its11h term.

Answer»

First term = aCommon diff. = d6th term = a + 5da + 5d = 0 a = -5d

21st term = a + 20d = -5d + 20d = 15d11th term = a + 10d = -5d + 10d = 5d Therefore,21st term = 3 * 11th term = 3 * 5d = 15d (proved)