Say you have 20 cases that have a different prize ranging from a car to a bucket. What is the probability that within the first 5 cases you don't open the car?

Question

anonymous · Answer

odds of getting it with the first one are 1 in 20

on the second one however the odds are 1 in 19
the third is 1 in 18
fourth 1 in 17
fifth 1 in 16

can you work it out from here?

anonymous · Answer

so I would just multiply the odds of each pick?

anonymous · Answer

remember that you're trying to work out the odds of not getting the car. the odds of not getting the car the first time is 1 in 19