2.7 Suppose that you and a friend play a “matching pennies” game in which each of you uncovers a penny. If both pennies show heads or both show tails, you keep both. If one shows heads and the other shows tails, your friend keeps them. Show the payoff matrix. What, if any, is the pure-strategy Nash equilibrium to this game? Does this game have a mixed-strategy Nash equilibrium? If so, what is it?