Any term of an AP (except first ) is equal to hal the sum of half sum of terms which arae equidistant from it .

Any term of an AP (except first ) is equal to half the sum of terms which are equidistant from it .

If the first term of an A.P. is 3 and the sum of its first 25 terms is equal to the sum of its next 15 terms, then the common difference of this A.P. is:

The first term of an A.P. is 3.The sum of first 25 terms is equal to the sum of next 15 terms.Find the common difference of the A.P.

If the first term of an AP is 2 and the sum of the first five terms is equal to one-fourth of the sum of the next five terms, then what is the sum of the first ten terms?

If the sum of the first 9 terms of an AP is equal to the sum of its first 11 terms, then find the sum of its first 20 terms.

If the sum of the first 9 terms of an AP is equal to the sum of its first 11 terms, then find the sum of its first 20 terms.

If the first term of an A.P. is 2 and the sum of the first five terms is equal to one fourth of the sum of the next five terms, find (i) the 20th term (ii) the sum of first 30 terms.

The sum of the first n-terms of the arithmetic progression is equal to half the sum of the next n terms of the same progression.Find the ratio of the sum of the first 3n terms of the progressionto the sum of its first n-terms.