Using the digits 1, 2, 3, 4, 5, how many even three-digit numbers less than 500 can be formed if each digit can be used at most once?
124 , 132 , 134 , 142 , 152 , 154 , 214 , 234 , 254 , 312 , 314 , 324 , 342 , 352 , 354 , 412 , 432 , 452>>Total = 18 such numbers
