Advertisements
Advertisements
प्रश्न
What is the sum of first 10 terms of the A. P. 15,10,5,........?
पर्याय
(A) -75
(B) -125
(C) 75
(D) 125
Advertisements
उत्तर
(A) -75
APPEARS IN
संबंधित प्रश्न
If the sum of first 7 terms of an A.P. is 49 and that of its first 17 terms is 289, find the sum of first n terms of the A.P.
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)
An A.P. consists of 50 terms of which 3rd term is 12 and the last term is 106. Find the 29th term of the A.P.
Find the sum given below:
–5 + (–8) + (–11) + ... + (–230)
Find the sum of first 40 positive integers divisible by 6.
Find the sum of the following arithmetic progressions:
41, 36, 31, ... to 12 terms
How many terms are there in the A.P. whose first and fifth terms are −14 and 2 respectively and the sum of the terms is 40?
Find the sum of all integers between 84 and 719, which are multiples of 5.
Find the sum 3 + 11 + 19 + ... + 803
Find the sum of the first 15 terms of each of the following sequences having the nth term as
`a_n = 3 + 4n`
Find the sum of first 12 natural numbers each of which is a multiple of 7.
Find the sum of all multiples of 7 lying between 300 and 700.
If the sum of a certain number of terms starting from first term of an A.P. is 25, 22, 19, ..., is 116. Find the last term.
Find the sum \[7 + 10\frac{1}{2} + 14 + . . . + 84\]
If the 10th term of an A.P. is 21 and the sum of its first 10 terms is 120, find its nth term.
If 18th and 11th term of an A.P. are in the ratio 3 : 2, then its 21st and 5th terms are in the ratio
Suppose three parts of 207 are (a − d), a , (a + d) such that , (a + d) >a > (a − d).
An AP consists of 37 terms. The sum of the three middle most terms is 225 and the sum of the last three is 429. Find the AP.
If the last term of an A.P. of 30 terms is 119 and the 8th term from the end (towards the first term) is 91, then find the common difference of the A.P. Hence, find the sum of all the terms of the A.P.
