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What am I doing wrong here?
A bag contains 3 gold coins & 7 silver coins. The bag contains nothing else. If 3 coins are selected at random and without replacement from the bag, what is the probability that exactly 2 coins are silver?
7/10 * 6/9 * 3/8 = 7/40 <--- But this is not the answer
Thank you!
A bag contains 3 gold coins & 7 silver coins. The bag contains nothing else. If 3 coins are selected at random and without replacement from the bag, what is the probability that exactly 2 coins are silver?
7/10 * 6/9 * 3/8 = 7/40 <--- But this is not the answer
Thank you!