Chapter 5 – Arithmetic Progressions

1) Calculate the sum of

Ans –

3) The ratio of the sum of first n terms of two AP’s is 7n + 1: 4n + 27. Find the ratio of their 11^th terms.

4) Show that (3p + 1)^th term of an A.P is twice the (p + q + 1)^th term. Given that (p + 1)^th term  is twice the (q + 1)^th term.