Advertisements
Advertisements
प्रश्न
What is the 5th term form the end of the AP 2, 7, 12, …., 47?
Advertisements
उत्तर
The given AP is 2, 7, 12, ..., 47.
Let us re-write the given AP in reverse order i.e. 47, 42, .., 12, 7, 2.
Now, the 5th term from the end of the given AP is equal to the 5th term from beginning ofthe AP 47, 42,.... ,12, 7, 2.
Consider the AP 47, 42,..., 12, 7, 2.
Here, a = 47 and d = 42 – 47 = –5
5th term of this AP
= 47 + (5 – 1) × (–5)
= 47 – 20
= 27
Hence, the 5th term from the end of the given AP is 27.
APPEARS IN
संबंधित प्रश्न
Find the sum of all numbers from 50 to 350 which are divisible by 6. Hence find the 15th term of that A.P.
In an A.P., if S5 + S7 = 167 and S10=235, then find the A.P., where Sn denotes the sum of its first n terms.
In an AP given l = 28, S = 144, and there are total 9 terms. Find a.
If the sum of the first n terms of an AP is 4n − n2, what is the first term (that is, S1)? What is the sum of the first two terms? What is the second term? Similarly, find the 3rd, the 10th, and the nth terms.
Find the sum of first 12 natural numbers each of which is a multiple of 7.
The first and the last terms of an A.P. are 34 and 700 respectively. If the common difference is 18, how many terms are there and what is their sum?
Find the sum of first n terms of an AP whose nth term is (5 - 6n). Hence, find the sum of its first 20 terms.
The sum of the first n terms in an AP is `( (3"n"^2)/2 +(5"n")/2)`. Find the nth term and the 25th term.
Choose the correct alternative answer for the following question .
What is the sum of the first 30 natural numbers ?
Choose the correct alternative answer for the following question .
In an A.P. first two terms are –3, 4 then 21st term is ...
The Sum of first five multiples of 3 is ______.
In an A.P., the sum of first ten terms is −150 and the sum of its next ten terms is −550. Find the A.P.
The sum of first n terms of an A.P. is 5n − n2. Find the nth term of this A.P.
The sum of first n odd natural numbers is ______.
The first three terms of an A.P. respectively are 3y − 1, 3y + 5 and 5y + 1. Then, y equals
Q.6
Find second and third terms of an A.P. whose first term is – 2 and the common difference is – 2.
If the numbers n - 2, 4n - 1 and 5n + 2 are in AP, then the value of n is ______.
Assertion (A): a, b, c are in A.P. if and only if 2b = a + c.
Reason (R): The sum of first n odd natural numbers is n2.
The sum of all two digit numbers is ______.
