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?
A. 2/15
B. 4/18
C. 7/90
D. 1/10
1 answer:
Answer:
2/15.
Step-by-step explanation:
The prime numbers in the first 10 numbers are: 2, 3, 5, 7 . That is a total of 4.
Prob( first number drawn is prime) = 4/10 = 2/5.
Prob( second number drawn is prime) = 3/9 = 1/3.
Required probability is 2/5 * 1/3
= 2/15.
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