Question

A three digit number is created using the digits 4, 5, and 6. Each digit may only be used once. What is the probability that the three digit number will be less than 550?

Please Help!!
Thank You!!
Reiny
since there are only 6 possibilities, lets list them
456, 465, 546, 564, 645, 654

how many of these are less than 550 ?

so ....