Each throw of an unfair 6-sided die lands on each of the odd numbers 1,3,5 with probability c and on each of the even numbers with probability 2c. (a) Find c. (b) Suppose the die is tossed. Let X equal 1 if the result is an even number, and let it be 0 otherwise. Let Y equal 1 if the result is a number greater than 3, and let Y be 0 otherwise. Find the joint probability mass function