A box contains 5 white and 7 black balls. Two successive drawn of 3 balls are made
2 answers:
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Divide both sides by -3, and replace with
. Then
Factorize the quadratic in to get
which in turn means
But for all real
, so we can ignore the first solution. This leaves us with
If we allow for any complex solution, then we can continue with the solution we ignored:
