Phonesmart is having a sale on Bananas If you buy one Banana

Phonesmart is having a sale on Bananas. If you buy one Banana at full price, you get a second at half price. When couples come in to buy a pair of phones, sales of Apricots and Bananas are equally likely. Moreover, given that the first phone sold is a Banana , the second phone is twice as likely to be a Banana rather than an Apricot. What is the probability that a couple buys a pair of Bananas?

Solution

probability that a couple buys a pair of Bananas = 1*2/(2*3) = 0.33