Question

There are 3 white marbles and 7 blue marbles in a bag. Jamie will randomly pick two marbles out of the bag without replacing the first marble chosen. What is the probability of Jamie's picking 2 white marbles? A) 1 15 B) 1 18 C) 1 20 D) 1 7

Answer 1

The probability of drawing a white marble the first time is 3/10.  Then, since she didn't replace the first white marble, the probability of drawing another white marble is 2/9.  We multiply these fractions together and get 1/10 or .1 or 10%