definition of mode

Let us revisit the definition of mode. It goes like ... mode (p) = p , if p > = zero = - p , if p < zero. Now let us take the question here, Is mode (x) = y - z? (A) says, x = z - y, thus by definition mode (x) = z - y, if x = z - y > = zero = y - z, if X = z - y < zero Thus (A) is not enough to sur...