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A hat contains a number of cards with 30...

A hat contains a number of cards with 30% white on both sides, 50% black on one side and whit e on the other side, 20% black on both sides. The cards are mixed up, and a single card is drawn at random and placed on the table. Its upper side shows up black. The probability that its other side is also black is `2//9` b. `4//9` c. `2//3` d. `2//7`

A

`2/9`

B

`4/9

C

`2/3`

D

`2/7`

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