In this exercise, the random variable n represents the number of units of a product sold per day in a store. The probability distribution of n is given by P(n). Find the probability that two units are sold in a given day [P(2)] and find P(0) + P(1) + P(2) + P(3) + . . . . P(n) = 1 6 5 6 n P(2) = [infinity] P(n) n = 0 =

example 2 – simplify: step 1: completely factor both the numerators and denominators of all fractions. step 2: change the division sign to a multiplication sign and flip (or reciprocate) the fraction after the division sign; essential you need to multiply by the reciprocal. step 3 : cancel or reduce the fractions.