M=3 and d=2 then 2m+d equals

A. 127 cm^2 b. 144.5 cm^2 c. 172 cm^2 d. 50 cm^2

Can some one me with these questions

If the ratio of sum of the first m and n terms of an ap is m2 : n2 , show that the ratio of its mth and nth terms is (2m − 1) : (2n − 1).