Question

OMG HELP!

6 pink, 8 green, 5 orange, and 9 white
What is the probability that Sue will select a green marble and then a white marble without replacing the first marble? How?

Answer 1

okay so she has 6+8+5+9 marbles. that is 28
the chance that she will first pick a green marble is the number of green marbles over the total number of marbles or 8/28 this is reduced to 2/7
If she does not replace the marble the next pick there will be 27 total marbles.
the chance of a white marble is white marbles/all marbles
or 9/27 reduced to 1/3
the probability of both is the first probability times the second probability

2/7 times 1/3 or 2/21