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Random and placed on the table

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Reference no: EM131796762

A hat contains a number of cards, with

30% white on both sides:

50% black on one side and white on the other:

20% black on both sides.

The cards are mixed up, then a single card is drawn at random and placed on the table. If the top side is black what is the chance that the other side is white?

Reference no: EM131796762

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