... 4 ways to choose a ring for the left hand and, foreach such choice, there are three ways to choose a ring for the right hand.Hence, there are 4 ·3 = 12 ways to choose a ring for each hand. This ... a random vector. Each componentof the random vector X is a random variable.Next, we define a function g : 2→ byg(x1, x2) = x1+ x2.The composition g(X) is equivalent to the random ... representation, the random variable X1counts thenumber of Heads observed on the first toss and the random variable X2counts the number of Heads observed on the second toss. The sum ofthese random variables,...