A three digit Hexadecimal (base-16) number is chosen at random, with each number having an equal probability of being chosen. Its digits are rearranged in every possible way, and all of the distinct arrangements of its digits are added together. (For example, if the number is 100(base)16, the sum would be 100(base)16+010(base)16+001(base)16=111(base)16. ) What is the probability that the sum is divisible by 5?

Guest Jan 18, 2022