1. Teacher's Notes Topic: Probability L7 Coins A teacher has some coins in his pocket. He is going to take one of the coins at random. He says: List all the coins that could be in his pocket. A. There are more than four coins in my pocket. B. The total value of the coins is 25p. C. The probability that I will take a 1p coin is ¼ Try the original question (briefly) Version 2: the question but without statement C Version 3: the question but without statement B Version 4: the question but without statement A Now repeat the original question. Which of the 'Versions' made it easiest to answer the original question? Why can't there be 6 coins? How many different answers are there?

2. A. There are more than four coins in my pocket. B. The total value of the coins is 25p. C. The probability that I will take a 1p coin is ¼ List all the coins that could be in his pocket. A teacher has some coins in his pocket. He is going to take one of the coins at random. He says: Coins Original version

3. A. There are more than four coins in my pocket. B. The total value of the coins is 25p. C. The probability that I will take a 1p coin is ¼ List all the coins that could be in his pocket. A teacher has some coins in his pocket. He is going to take one of the coins at random. He says: Coins Version 2

4. A. There are more than four coins in my pocket. B. The total value of the coins is 25p. C. The probability that I will take a 1p coin is ¼ List all the coins that could be in his pocket. A teacher has some coins in his pocket. He is going to take one of the coins at random. He says: Coins Version 3

5. A. There are more than four coins in my pocket. B. The total value of the coins is 25p. C. The probability that I will take a 1p coin is ¼ List all the coins that could be in his pocket. A teacher has some coins in his pocket. He is going to take one of the coins at random. He says: Coins Version 4

6. A. There are more than four coins in my pocket. B. The total value of the coins is 25p. C. The probability that I will take a 1p coin is ¼ List all the coins that could be in his pocket. A teacher has some coins in his pocket. He is going to take one of the coins at random. He says: Coins Original version