Can someone please help me with this questions.Appreciate the help:)

What condition must nonnegative integers m, n, and p satisfy for xmyn lim (x,y) -(0,0) (202 + 22) p to exist? Prove your answer: show the limit exists when your condition holds, and that the limit does not exist otherwise. [Note: if m = n = p = 0, then the limit trivially exists and equals 1; you may exclude this case when proposing your condition.] Questions continue on next page