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A bag contains 10 white and 3 black ball...

A bag contains 10 white and 3 black balls. Balls are drawn one-by-one without replacement till all the black balls are drawn. The probability that the procedure of drawing balls will come to an end at the seventh draw, is

A

`(15)/(286)`

B

`(105)/(286)`

C

`(35)/(286)`

D

`(7)/(286)`

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The correct Answer is:
A
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