10 cards are numbered from 1 to 10 and placed in a box. One card is selected at random and is not replaced. Another card is then randomly selected. What is the probability of selecting two prime numbers?
First you need to know the prime numbers from 1-10. They are 2, 3, 5, 7, 1st draw: P(prime) = 4/10 2nd draw: P(prime) = 3/9 Multiply these numbers 12/90 = 2/15
