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
उत्तर
(A) -75
APPEARS IN
संबंधित प्रश्न
The sum of three numbers in A.P. is –3, and their product is 8. Find the numbers
Check whether -150 is a term of the A.P. 11, 8, 5, 2, ....
If the 3rd and the 9th terms of an AP are 4 and –8 respectively, which term of this AP is zero?
Find the 12th term from the end of the following arithmetic progressions:
3, 5, 7, 9, ... 201
Find the sum of 28 terms of an A.P. whose nth term is 8n – 5.
The fourth term of an A.P. is 11 and the eighth term exceeds twice the fourth term by 5. Find the A.P. and the sum of first 50 terms.
Determine the nth term of the AP whose 7th term is -1 and 16th term is 17.
If 18, a, (b - 3) are in AP, then find the value of (2a – b)
The sum of 5th and 9th terms of an A.P. is 30. If its 25th term is three times its 8th term, find the A.P.
Find where 0 (zero) is a term of the A.P. 40, 37, 34, 31, ..... .
If the sum of first n terms of an A.P. is \[\frac{1}{2}\] (3n2 + 7n), then find its nth term. Hence write its 20th term.
If 18, a, b, −3 are in A.P., the a + b =
The term A.P is 8, 10, 12, 14,...., 126 . find A.P.
Q.19
Find the value of x, when in the A.P. given below 2 + 6 + 10 + ... + x = 1800.
In an A.P. (with usual notations) : given d = 5, S9 = 75, find a and a9
In an A.P. sum of three consecutive terms is 27 and their products is 504. Find the terms. (Assume that three consecutive terms in an A.P. are a – d, a, a + d.)
If the first term of an AP is –5 and the common difference is 2, then the sum of the first 6 terms is ______.
The students of a school decided to beautify the school on the Annual Day by fixing colourful flags on the straight passage of the school. They have 27 flags to be fixed at intervals of every 2 m. The flags are stored at the position of the middle most flag. Ruchi was given the responsibility of placing the flags. Ruchi kept her books where the flags were stored. She could carry only one flag at a time. How much distance did she cover in completing this job and returning back to collect her books? What is the maximum distance she travelled carrying a flag?
Find the value of a25 – a15 for the AP: 6, 9, 12, 15, ………..
