Solution - Sum of First n Terms of an AP

Account
Register

Share

Books Shortlist
ConceptSum of First n Terms of an AP

Question

The first and the last terms of an AP are 8 and 65 respectively. If the sum of all its terms is 730, find its common difference.

Solution

You need to to view the solution
Is there an error in this question or solution?

Similar questions VIEW ALL

200 logs are stacked in the following manner: 20 logs in the bottom row, 19 in the next row, 18 in the row next to it and so on. In how many rows are the 200 logs placed and how many logs are in the top row?

view solution

The ratio of the sums of m and n terms of an A.P. is m2 : n2. Show that the ratio of the mth and nth terms is (2m – 1) : (2n – 1)

view solution

If Sn denotes the sum of first n terms of an A.P., prove that S30 = 3[S20S10]

view solution

In an AP

Given an = 4, d = 2, Sn = − 14, find n and a.

view solution

A ladder has rungs 25 cm apart. (See figure). The rungs decrease uniformly in length from 45 cm at the bottom to 25 cm at the top. If the top and bottom rungs are 2 1/2 m apart, what is the length of the wood required for the rungs?

[Hint: number of rungs = 250/25 ]

view solution

Reference Material

Solution for concept: Sum of First n Terms of an AP. For the course 8th-10th CBSE
S