A cooler contains 8 cans of soda's, 5 cokes,2 orange and 1 cherry. Two cans are slected at random without replacement. Find the probality that at leats one can is a coke. The prob that one can is a coke is?

Question

dumbcow · Answer

Look at probability that none are cokes
can 1:
3/8 because 3 cans are not cokes
can 2:
2/7 you already took a non-coke leaving 2 out of the 7 remaining cans
P(none) = 3/8*2/7 = 6/56 = 3/28
 so P(at least 1)  = 1 - 3/28

anonymous · Answer

8C2 = 28 means there are 28 possible ways to select two cans.  Out of those selections, 3 selections do not contain a coke = 25/28, which is also 5 squared (5 cokes, 2 chances) over 8C2.

anonymous · Answer

so 25/28?

dumbcow · Answer

yes

anonymous · Answer

yes

anonymous · Answer

r u guys like math teachers or something? u guys know everything!