1. What's the angle between hour and minute at 11:40? 2. Four fair coins. 1) Probability of at least 2 heads 2) Given there are at least 2 heads, expectation of number of heads 3. Two fair dice, one 6-side, the other 10-side. You guess the sum x of two dice, if you are right, you get $x, otherwise nothing happens. Which number should you guess?