Find the value of a_{2}+a_{4}+a_{6}+\cdots+a_{98} if a_{1}, a_{2}, a_{3}, \ldots is an arithmetic progression with common difference 1 , and a_{1}+a_{2}+a_{3}+\cdots+a_{98}=137.
Find the value of a_{2}+a_{4}+a_{6}+\cdots+a_{98} if a_{1}, a_{2}, a_{3}, \ldots is an arithmetic progression with common difference 1 , and a_{1}+a_{2}+a_{3}+\cdots+a_{98}=137.