HELPPP!!!! pls
There are four blood types, and not all are equally likely
to be in blood banks. In a certain blood bank, 49% of
donations are Type O blood, 27% of donations are
Type A blood, 20% of donations are Type B blood, and
4% of donations are Type AB blood. A person with Type
B blood can safely receive blood transfusions of Type
O and Type B blood.
What is the probability that the 4th donation selected at
random can be safely used in a blood transfusion on
someone with Type B blood?
(0.31)³(0.69)
(0.51)³(0.49)
(0.69)³(0.31)
(0.80)³(0.20)