Introduction|nth term of an AP|Questions|Sum of First n terms of an AP|Questions

Sum Of n Terms Of An A.P.|Questions

Questions on Sum of n terms in A.P.

If the sum of the first four terms of an AP is 40 and the sum of the first fourteen terms of an AP is 280. Find the sum of first n terms of the A.P.

(i) The sum of the first n terms of an AP is ((5n^(2))/(2) + (3n)/(2)) . Find the nth term and the 20th term of this AP. (ii) The sum of the first n terms of an AP is ((3n^(2))/(2) + (5n)/(2)). Find its nth term and the 25th term.

if nth term of an AP is 3n+2 then find the sum n terms.

Find the sum of first 20 terms of an AP whose nth term is 4n-1

The nth term of an AP. Is (3+n)/(4) , then the sum of first 105 terms is

Question on nth terms in A.P.

If sum of first 20 terms of an A.P. is equal to sum of first 30 terms of the A.P. then sum of the first 50 terms of the A.P. is

Theory OF Sum OF First n Terms OF A.P