A2) Let A denote the set of all 5 digit numbers that are divisible by 6 and B denote the set of all 5 digit numbers that are divisible by 7. Determine the number of elements in A∪B? A3. Assume that...

A2) Let A denote the set of all 5 digit numbers that are divisible by 6 and B denote the set of all 5 digit numbers that are divisible by 7. Determine the number of elements in A∪B? A3. Assume that you have two boxes. The first box contains 5 green balls and 6 black balls and the second box contains 3 green balls and 4 black balls. You select one of the two boxes at random and selecting a ball from this box at random. What is the probability that you pick a ball from the second box if you have selected a green ball?