#8 – Heads or Tails
You and your friend have 9 and 10 coins, respectively. Both of you toss your coins and then count the number of heads that result. What is the probability that your friend has obtained more heads than you have?
The Prize for This Question: Rubik’s Cube Keychain
The Winner of Puzzle #6: Muhammet Emre Şahinoğlu
This question was prepared by Emrehan Halıcı, president of the Turkey Intelligence Foundation, for Bilkent IEEE.