A box contains 12 balls out of which x are black. if one hall is drawn at random from the box what is the probability that it will be a black ball?

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Solution

Total no $.$ of ball $= 12$
No $.$ of black balls $= x$
$P (B) = \frac{x}{12}$

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A box contains 12 balls out of which x are black. if one hall is drawn at random from the box what is the probability that it will be a black ball?

Total no. of ball=12No. of black balls =xP(B)=x12

Total no $.$ of ball $= 12$
No $.$ of black balls $= x$
$P (B) = \frac{x}{12}$