You have the misfortune to own an unreliable clock. This one loses exactly 20 minutes every hour. It is now showing 4:00am and you know that is was correct at midnight, when you set it. The clock stopped 4 hours ago, what is the correct time now?
July 23, 2015
July 6, 2015
A man tosses three coins in the air. When they land, he finds that two of the coins have heads up and one has tails up. What is the probability that when the coins are tossed again, they will land again with two heads up and one tails up. Please note that the coins are unbiased.