A bag of marbles is filled with red and blue marbles. There are 24
marbles in the bag. The probability of Pete picking a blue marble
out of the bag is 3/4.How many blue marbles are in the bag? What is
the probability that pete picks a red marble?
A bag of marbles is filled with red and blue marbles. There are 24
marbles in the bag. The probability of Pete picking a blue marble
out of the bag is 3/4.How many blue marbles are in the bag? What is
the probability that pete picks a red marble?
If you have a 3/4 chance of picking out a blue marble, than 4/4 of the marbles are blue.
So:
And obviously there's a 1/4 chance he'll pick a red marble.