Advertisements
Advertisements
प्रश्न
If d = – 5, n = 10, an = 68, then find the first term.
पर्याय
113
23
– 113
– 23
उत्तर
113
Explanation:
Given: d = – 5, n = 10, an = 68
Now, we know
an = a + (n – 1)d
68 = a + (10 – 1) (– 5)
68 = a + (9) ( – 5) = a – 45
a = 68 + 45
= 113
APPEARS IN
संबंधित प्रश्न
For what value of k will k + 9, 2k – 1 and 2k + 7 are the consecutive terms of an A.P?
Find the 12th , 24th and nth term of the A.P. given by 9, 13, 17, 21, 25, ………
Write first four terms of the A.P. when the first term a and the common difference d are given as follows:
`a = -1, d = 1/2`
Following are APs or not? If they form an A.P. find the common difference d and write three more terms:
12, 32, 52, 72 …
Following are APs or not? If they form an A.P. find the common difference d and write three more terms:
12, 52, 72, 73 …
If the 10th term of an A.P. is 52 and the 17th term is 20 more than the 13th term, find the A.P.
Write the arithmetic progressions write the first term a and common difference d is as follows:
a = -1.5, d = -0.5
Two arithmetic progressions have the same common difference. The difference between their 100th terms is 100, what is the difference between their l000th terms?
Find the value of x for which (8x + 4), (6x − 2) and (2x + 7) are in A.P.
Find the common difference of the A.P. and write the next two terms 1.8, 2.0, 2.2, 2.4, ...
How many three digit numbers are divisible by 7?
Check whether the following sequence is in A.P.
a – 3, a – 5, a – 7, …
Check whether the following sequence is in A.P.
`(-1)/3, 0, 1/3, 2/3, ...`
The ratio of 6th and 8th term of an A.P. is 7:9. Find the ratio of 9th term to 13th term
If 6 times of 6th term of an A.P. is equal to 7 times the 7th term, then the 13th term of the A.P. is
The nth term of an A.P. is given by an = 3 + 4n. The common difference is ______.
In which of the following situations, do the lists of numbers involved form an AP? Give reasons for your answers.
The fee charged from a student every month by a school for the whole session, when the monthly fee is Rs 400.
Which term in the A.P. 60, 56, 52, 48, 44, 40, ...... is the first negative term?
The school auditorium was to be constructed to accommodate at least 1500 people. The chairs are to be placed in concentric circular arrangement in such a way that each succeeding circular row has 10 seats more than the previous one.
- If the first circular row has 30 seats, how many seats will be there in the 10th row?
- For 1500 seats in the auditorium, how many rows need to be there?
OR
If 1500 seats are to be arranged in the auditorium, how many seats are still left to be put after the 10th row? - If there were 17 rows in the auditorium, how many seats will be there in the middle row?
The next term of the A.P. : `sqrt(6), sqrt(24), sqrt(54)` is ______.
