Advertisements
Advertisements
Question
What is the sum of first 10 terms of the A. P. 15,10,5,........?
Options
(A) -75
(B) -125
(C) 75
(D) 125
Solution
(A) -75
APPEARS IN
RELATED QUESTIONS
The houses in a row numbered consecutively from 1 to 49. Show that there exists a value of x such that sum of numbers of houses preceding the house numbered x is equal to sum of the numbers of houses following x.
If Sn1 denotes the sum of first n terms of an A.P., prove that S12 = 3(S8 − S4).
In an AP Given a12 = 37, d = 3, find a and S12.
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?
Find the sum of all integers between 50 and 500, which are divisible by 7.
Find the sum of all multiples of 7 lying between 300 and 700.
The sum of three consecutive terms of an AP is 21 and the sum of the squares of these terms is 165. Find these terms
Find four numbers in AP whose sum is 8 and the sum of whose squares is 216.
What is the sum of first n terms of the AP a, 3a, 5a, …..
The first term of an AP is p and its common difference is q. Find its 10th term.
How many terms of the AP 21, 18, 15, … must be added to get the sum 0?
Find the sum of all natural numbers between 200 and 400 which are divisible by 7.
The first and last terms of an A.P. are 1 and 11. If the sum of its terms is 36, then the number of terms will be
The common difference of an A.P., the sum of whose n terms is Sn, is
The common difference of the A.P.
The sum of the first three terms of an Arithmetic Progression (A.P.) is 42 and the product of the first and third term is 52. Find the first term and the common difference.
Find the sum of first 10 terms of the A.P.
4 + 6 + 8 + .............
The sum of first ten natural number is ______.
Find the middle term of the AP. 95, 86, 77, ........, – 247.
Find the sum of first 16 terms of the A.P. whose nth term is given by an = 5n – 3.
