Question

An urn contains 9 red, 7 white and 4 black balls A ball is drawn at random What is the probability that the ball drawn is not red ?

• A. $\frac{1}{11}$
• B. $\frac{9}{11}$
• C. $\frac{2}{11}$
• D. $\frac{11}{20}$

Answer 1

Answer: (D)

$\frac{11}{20}$

Since, total no. of balls = $9+7+4=20$
No. of balls that are not red = $7+4=11$
$\therefore$ Required probability = $\frac{11}{20}$
$\therefore$ Option D is correct.