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Q.

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

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

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a

\frac{4}{23}

b

\frac{5}{23}

c

\frac{6}{23}

d

\frac{5}{21}

answer is A.

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Detailed Solution

$P (1 o r 2) = 0.1 + 0.32 = 0.42$

$P (\frac{1}{1 o r 2}) = \frac{0.1}{0.42} = \frac{5}{21}$

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