Arithmetic sequence (25,21,17,....) n=? a=25 , Sn=-195?
or:Arithmetic sequence (25,21,17,....) n=? a=25 , Sn=-195?
or:Arithmetic sequence (25,21,17,....) n=? a=25 , Sn=-195?
Tags:sequence,
or:Arithmetic sequence (25,21,17,....) n=? a=25 , Sn=-195?
Tags:sequence,