What is the probability you withdrew a nickel and then a dime if the bag held ten pennies, six nickels, and five dimes?

Question

You reach into a bag of coins and withdrew two coins without replacement. What is the probability you withdrew a nickel and then a dime if the bag held ten pennies, six nickels, and five dimes?

Answer 1

10 + 6 + 5 = 21

P(nickel) = 6/21 = 2/7

P(dime) = 5/20 = 1/4

P(nickel and dime) = 2/7 X 1/4 = 1/14