Sum of first 10 terms of an AP is 100 andfirst 25 terms is 625. Find the numberof terms in it, whose sum is 441.

Sum of the first 14 terms of an AP is 1505 and its first term is 10. Find is 25th term.

Sum of the first 14 terms of an AP is 1505 and its first term is 10. Find is 25 th term.

If the sum of first 10 terms of an A.P is 60 and sum of first 15 terms is -165 then find the sum of its n terms

The sum of first 14 terms of an AP is 1050 and its first term is 10, then find the 21st term of the AP.

The sum of first 14 terms of an AP is 1050 and its first term is 10, then find the 21st term of the AP.

The sum of first 7 terms of an A.P. is 49 and that of first 17 terms of it is 289. Find the sum of first n terms.

The sum of the first 8 terms of an A.P. is 100 and the sum of its first 19 terms is 551. Find the first term and the common difference of the AP.

If the sum of first nine terms of an A.P is 171 and that of first 24 terms is 996,find the sum of first 41 terms.

The sum of first nine terms of an A.P. is 171 and that of 24 terms is 996. Find the sum of first 16 terms.