# Blood types A, B, O, and AB have percentages 40%, 20%, 30% and 10%. If two individuals are chosen at random, assuming independence, how do you find probability that neither is of blood type A?

The probability is $0.36$ or 36%
The probability that one chosen person is off blood type $A$ is 40%=0.4 so the probability that he is not of blood type $A$ is $0.6$.
To calculate the probability that none of $2$ people is of blood type $A$ you have to multiply the probabilities:
$0.6 \times 0.6 = 0.36$ or 36%.