What the answer to this problem 4(9p+6)

Name each raycalculation tip: in ray "ab", a is the endpoint of the ray.

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).

15 and 14.7 are 1 apart, so 15 – 14.7 must be 1.