Sum of n Terms of an A.P. | Examples

If the sum of m terms of an A.P. is same as the sum of its n terms, then the sum of its (m+n) terms is

The sum of m and n terms of an A.P. are n and m respectively. Prove that the sum of (m + n) terms will be - (m+n).

The sum of 5 and 15 terms of an A.P. are equal. Find the sum of 20 terms of this A.P.

If the sum of first n terms of an A.P. is an^(2) + bn and n^(th) term is An + B then

Sum of first terms of an A.P. is 9 less than the sum of next 3 terms of the same A.P. and second term is 2 then 4^(th) term of that A.P. is :

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

If the sum of m terms of an A.P is equal to these that n terms and also to the sum of the next p terms,prove

If the sum of m terms of an A.P is equal to these that n terms and also to the sum of the next p terms,prove