Question

Please help! Correct answers only please!

You pick a card at random. Without putting the first card back, you pick a second card at random.

What is the probability of picking a prime number and then picking a prime number?

Simplify your answer and write it as a fraction or whole number.

Answer 1

1/6

Explanation:

There are 4 cards, 2 of which are primes

P(prime) =number of primes/total

= 2/4 = 1/2

Keep the card, now we have 3 cards, 1 of which is a prime

P(prime) =number of primes/total

= 1/3

P(prime, keep , prime) = 1/2*1/3 = 1/6