Exercise 1

Inside a dusty chest marked “Halloween costumes” in the family attic, there are four different outfits (a wizard's cape, army fatigues, and two others), five different headgears (a batman helmet, a headband, a tiara, etc.), and nine different accessories (a wand, a lightsaber, a pipe, and many others). If a child were to choose a costume by selecting one outfit, one headgear, and one accessory, how many costume choices would he/she have?