13. A log yard uses 3 digit numbers to identify their current stock... [*Exercise 3. i 3] a) How many 3 digit numbers can be formed from the digits 0, 1, 2, 3, 4 and 5 if each digit can be used only once and the number cannot begin with O? (Hint: there is a mathematical solution, but you may find it easier to start with a diagram) b) What is the probability of having a number greater than 330 given the above (Q 13a) constraints? (Hint: spiit the problem into two iogicai number sets and solve for each set)