Problem of the Week-7

Consider the number 12355699. If we write each of the digits in this number on separate slips of paper, put them in a bowl, and draw 3 of these numbers at random, without replacement, what is the probability that the sum of the 3 numbers will be even? Explain your answer.

Posted: 11-27-07 Submit your answers (by e-mail or hard copy) before 4 pm on 12-7-07 to Noah Aydin.