question_answer

For a biased die the probabilities for different faces to turn up are given below

Face :	1	2	3	4	5	6
Probability :	0.1	0.32	0.21	0.15	0.05	0.17

The die is tossed and you are told that either face 1 or 2 has  turned up. Then the probability that it is face 1, is    [IIT 1981]

A)                 \[\frac{5}{21}\]    

B)                 \[\frac{5}{22}\]

C)                 \[\frac{4}{21}\]    

D)                 None of these