@@ -31,3 +31,2 @@
* Does the price of a call option increase when volatility increases?
-* 2 blue and 2 red balls, in a box, no replacing. Guess the colour of the ball, you receive a dollar if you are correct. What is the dollar amount you would pay to play this game?
* What is the singles digit for 2^230?
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* Two witches make a nightly visit to an all-night coffee shop. Each arrives at a random time between 0:00 and 1:00. Each one of them stays for exactly 30 minutes. On any one given night, what is the probability that the witches will meet at the coffee shop?
-* In a repeated Prisoner’s Dilemma, what is the Nash equilibrium if both players use tit-for-tat strategies?
+* In a repeated Prisoner’s Dilemma, what is the Nash equilibrium?
* A stick is broken into 3 parts, by choosing 2 points randomly along its length. With what probability can it form a triangle?