Suppose that in an assortment of 30 calculators there are 5 with defective switches. Draw with and without replacement. (Enter the probabilities as fractions.)
If two machines are selected at random, what is the probability that both have defective switches?
without replacement=

Question

Suppose that in an assortment of 30 calculators there are 5 with defective switches. Draw with and without replacement. (Enter the probabilities as fractions.) 
If two machines are selected at random, what is the probability that both have defective switches? 
without replacement=

anonymous · Answer

I know that I need to do this (5/30)(4/29), but it keeps saying the answer is wrong

perl · Answer

without replacement the probability both switches are defective is 

5/30 * 4/29 , = 20/870

anonymous · Answer

Yay it worked! THANK YOU SO MUCH!!

perl · Answer

:)