probability that none of 4 donors has Type-A blood

xc630

Junior Member
Joined
Sep 1, 2005
Messages
164
Hi, would appreciate some help with the following problem.

The following probabilities are for a person having the respective blood types.

0.45- type O
0.40- type A
0.11- type b
0.04- type ab

among four potential donors what is the probability that they are not all Type A

I did .4*.4*.4*.6 but that seems wrong as the answer is pretty small. How would I calculate this probability?
 
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