Tree Diagram
i) P(second ball will be white | first ball was black) = 3/9
= 1/3
ii) P(second ball will be white) = P(first ball was black and second ball will be white) + P(both first and second balls are white)
= (3/7 x 3/9) + (4/7 x 4/9)
= 0.3968
iii) P(second ball will be black) = 1 - P(second ball will be white)
= 1 - 0.3968
= 0.6032
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