Advertisements
Advertisements
प्रश्न
Choose the correct alternative answer for the following question .
15, 10, 5,... In this A.P sum of first 10 terms is...
विकल्प
-75
-125
75
125
उत्तर
The given sequence is 15, 10, 5,...
Here,
a = 15
d = –5
We know that,
APPEARS IN
संबंधित प्रश्न
Ramkali required Rs 2,500 after 12 weeks to send her daughter to school. She saved Rs 100 in the first week and increased her weekly saving by Rs 20 every week. Find whether she will be able to send her daughter to school after 12 weeks.
What value is generated in the above situation?
Find the sum of 20 terms of the A.P. 1, 4, 7, 10, ……
A sum of Rs 700 is to be used to give seven cash prizes to students of a school for their overall academic performance. If each prize is Rs 20 less than its preceding prize, find the value of each of the prizes.
A small terrace at a football field comprises 15 steps, each of which is 50 m long and built of solid concrete. Each step has a rise of
[Hint: Volume of concrete required to build the first step =
If the 12th term of an A.P. is −13 and the sum of the first four terms is 24, what is the sum of first 10 terms?
Find the sum of all 3-digit natural numbers, which are multiples of 11.
Find the middle term of the AP 6, 13, 20, …., 216.
Show that
The angles of quadrilateral are in whose AP common difference is 10° . Find the angles.
How many three-digit natural numbers are divisible by 9?
The first and the last terms of an A.P. are 7 and 49 respectively. If sum of all its terms is 420, find its common difference.
The first and last term of an A.P. are a and l respectively. If S is the sum of all the terms of the A.P. and the common difference is given by
In an AP. Sp = q, Sq = p and Sr denotes the sum of first r terms. Then, Sp+q is equal to
The number of terms of the A.P. 3, 7, 11, 15, ... to be taken so that the sum is 406 is
In an AP if a = 1, an = 20 and Sn = 399, then n is ______.
Find the sum of those integers from 1 to 500 which are multiples of 2 or 5.
[Hint (iii) : These numbers will be : multiples of 2 + multiples of 5 – multiples of 2 as well as of 5]
If the first term of an A.P. is p, second term is q and last term is r, then show that sum of all terms is
The nth term of an A.P. is 6n + 4. The sum of its first 2 terms is ______.
