A urn contains 9 red, 7 white and 4 black balls. Out of them... | Mathematics | SolveeIt | Solveeit

Today, October 3

Question

A urn contains 9 red, 7 white and 4 black balls. Out of them, one is drawn at random. The probability that the ball drawn will be a red or black, is

A

$\frac {9} {20}$

B

$\frac {7} {20}$

C

$\frac {11} {20}$

D

$\frac {13} {20}$

Answer

$\frac {13} {20}$

Explanation

Solution

Answer (d) $\frac {13} {20}$