Question

A box 'A' contains 2 white and 4 black marbles. Another box 'B' contains 5 white and 7 black
marbles. A marble is transferred from box 'A' to box 'B' and a ball is drawn at random from
box 'B'. What is the probability that it will be black.
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Answer 1

Answer:

Probability =4/6+7/12