Arectangular tile has a decorative pattern of 3 equal-sized squares, each of which is divided into 2 same-sized triangles. if marnie uses 36 of these tiles on the wall behind her kitchen stoves, how many triangles are displayed?

International calls require the use of a country code. many country codes a 3-digit numbers. country codes do not begin with a 0 or 1. there are no restrictions on the second and third digits. how many different 3-digit country codes are possible?