B, A, B, O, AB, O, A, AB, O, B, B, AB, AB, O, A, O, A, B, AB and O. A student is selected at random. Find the probability that his blood group is (i) A (ii) B (iii) AB (iv) O
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(i ) count the no of A ÷total blood groups
4÷20
probability is 1/5
similarly for (ii) ans is 5÷20=1/4
(iii) ans is 5/20=1/4
(iv) ans is 6/20=3/10
4÷20
probability is 1/5
similarly for (ii) ans is 5÷20=1/4
(iii) ans is 5/20=1/4
(iv) ans is 6/20=3/10
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