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From an um containing x white and y-x bl...

From an um containing x white and y-x black balls, n balls have been lost, then probability of drawing a white ball

A

before the loss `(x)/(y)`

B

after the loss is `(x)/(y)` for `n=1`

C

after the loss is `(x)/(y)` for n=2

D

after the loss is `(x)/(y)` for n=3.

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