A store sells three brands of cigarettes: $3.15 Star lights, $4.30 Vegas slims, and $5.20 Royal 100's. (Tax included) A man named Smokey walks into the store, and buys 2 packs of cigarettes, one pack for himself and the other pack for a friend. He hands the cashier a $20 note, and is returned a few bills and 3 coins in change (exclude dollars or half dollars). What's the probability, that the man smokes Royal 100's?

(In reply to solution by Dej Mar)

If every person is equally likely to smoke any of the three brands, then Star Lights and Vegas Slims should count twice as likely as either of the single-brand pairs--in the inital matrix of probabilities, it would be 2/9, rather than the 1/9 of either Vegas-Vegas or Royal-Royal.

So Royals would have a 1/4 probability.

Posted by Charlie on 2010-06-03 14:15:35