In an AP where the number of terms is odd, the sum of the first and the last term will be twice the middle term.
An AP consists of 23terms. If the sum of the three terms in the middle is 141. and the sum of the last three terms is261, then the first term is
Four numbers in an AP sum up to 32. The ratio of product of first and last term to that of the two middle terms is 7:15. Find the numbers