Box | Marble Colour | ||
Red | White | Black | |
A | 1 | 6 | 3 |
B | 6 | 2 | 2 |
C | 8 | 1 | 1 |
D | 0 | 6 | 4 |
Answer:
Let
E1, E2, E3 and E4 are the events of
selection of boxes A, B, C and D respectively.
Let
R = event of getting red ball.
We
have P(E1) = P(E2) = P(E2) = P(E4)
=
and
(R/E1) =
R(R/E1)
=
P(the
red ball is drawn fro the box A)
=
P(E2 /R)
P(the
red ball is drawn from the box B) = P(E2/R)
and
P (the red ball is drawn from the box C)
=
P(E3/R)
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