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A bon contains a white balls, 3 brack
balls and 4 red ball In how many ways
can 3 balls be drawn
,at least one blac

By Margaret

A bon contains a white balls, 3 brack
balls and 4 red ball In how many ways
can 3 balls be drawn
,at least one black
ball is to be included in the
draw ?
wing 다.
from the bone​

About the author
Margaret

Dooks COSTA
A can do a piece of work in 15 days while B can do it in 10 days How long wil they
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