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
Advertisements
Solution
(A) -75
APPEARS IN
RELATED QUESTIONS
Find four numbers in A.P. whose sum is 20 and the sum of whose squares is 120
The sum of the first p, q, r terms of an A.P. are a, b, c respectively. Show that `\frac { a }{ p } (q – r) + \frac { b }{ q } (r – p) + \frac { c }{ r } (p – q) = 0`
Determine the A.P. whose 3rd term is 16 and the 7th term exceeds the 5th term by 12.
Find the sum of the following arithmetic progressions:
41, 36, 31, ... to 12 terms
Find the sum of the following arithmetic progressions:
a + b, a – b, a – 3b, ... to 22 terms
Which term of the AP `5/6, 1, 1 1/6, 1 1/3,` ... is 3?
Which term of the AP 3,8, 13,18,…. Will be 55 more than its 20th term?
If 10 times the 10th term of an AP is equal to 15 times the 15th term, show that its 25th term is zero.
What is the sum of first n terms of the AP a, 3a, 5a, ....
If the sum of first p terms of an AP is (ap2 + bp), find its common difference.
Find the A.P. whose fourth term is 9 and the sum of its sixth term and thirteenth term is 40.
The first and the last terms of an A.P. are 8 and 350 respectively. If its common difference is 9, how many terms are there and what is their sum?
If `4/5`, a, 2 are three consecutive terms of an A.P., then find the value of a.
If the sums of n terms of two arithmetic progressions are in the ratio \[\frac{3n + 5}{5n - 7}\] , then their nth terms are in the ratio
The common difference of the A.P. \[\frac{1}{3}, \frac{1 - 3b}{3}, \frac{1 - 6b}{3}, ...\] is ______.
Q.3
Q.4
The sum of first six terms of an arithmetic progression is 42. The ratio of the 10th term to the 30th term is `(1)/(3)`. Calculate the first and the thirteenth term.
If the nth term of an AP is (2n + 1), then the sum of its first three terms is ______.
Find the sum of all even numbers from 1 to 250.
