Drawing Probability of Balls?

C

Chlorovote

New member
In a sack contains 4 balls, one is colored white, and the rest is black. A person took 2 balls from the sack. What is the probability that the balls taken contains a black ball.

P.S. Don't use the manual method by looking for the possible combinations (AB,AC,AD,etc). I need an equation.

Thanks!
 
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