Question

A bag contains 5 white, 4 red and 3 black balls. A ball is drawn at random from the bag. Find the probability that it is not black.

• A.
  
  $\frac{1}{4}$
  
• B.
  
  $\frac{3}{4}$
  
• C.
  
  $\frac{1}{2}$
  
• D.
  1

Answer 1

The correct option is B


$\frac{3}{4}$



Total number of balls=12
Probability of black ball, P(B)=$\frac{3}{12}$
Probability of not black ball, P(B’) =1-P(B)
$=1-\frac{3}{12}$
$=\frac{9}{12}$
$=\frac{3}{4}$
Correct option is option (b)