Thread: Probability that at least 1 was selected

Having a bit of trouble with this one: Any help will be appreciated.

Suppose you are going to draw 2 jellyfish, without replacement, from a tank that contains 5 mushroom jellyfish and 3 cannonball jellyfish. Find the probability that at least 1 cannonball jellyfish will be selected.

a. 5/15
b. 9/14
c. 15/28
d. 1

Originally Posted by sweetkendra

Having a bit of trouble with this one: Any help will be appreciated.

Suppose you are going to draw 2 jellyfish, without replacement, from a tank that contains 5 mushroom jellyfish and 3 cannonball jellyfish. Find the probability that at least 1 cannonball jellyfish will be selected.

a. 5/15
b. 9/14
c. 15/28
d. 1

.

, that is,

(the number of ways of choosing zero cannonball AND two mushroom0/(the number of ways of choosing two fish from eight).

Thank you for your help, I understand now.

Originally Posted by mr fantastic

.

, that is,

(the number of ways of choosing zero cannonball AND two mushroom0/(the number of ways of choosing two fish from eight).

Originally Posted by sweetkendra

Thank you for your help, I understand now.

You're very welcome. Lovely manners