Number of terms in an arithmetic progression is \(2 n\). Sum of terms occurring at even places is 40 and sum of terms oc…

Number of terms in an arithmetic progression is \(2 n\). Sum of terms occurring at even places is 40 and sum of terms occurring at odd places is 55 . If the first term exceeds the last term by 27 , then \(n\) equals to (22 Jan, Shift II, Memory Based)