Question

a jar contains a mixture of 20 black marbles, 16 red marbles, and 4 white marbles, all the same size. find the probability of drawing a white or red marble on the first draw.

Answer 1

There is a 50% chance of pulling a white OR red marble on the first try because there are a total of 40 marbles and 16+4 is 20 which makes up half of the marbles in the bag.

Answer 2

Answer:
`(1)/(2)`

Explanation:

Given: The number of black marbles in jar = 20

The number of red marbles in jar = 16

The number of white marbles in jar = 4

The total number of marbles in jar =
`20+16+4=40`

The probability of drawing white marble =
`P(W)=(4)/(40)`

The probability of drawing red marble =
`P(R)=(16)/(40)`

Now, the probability of drawing a white or red marble on the first drawis given by :

`P(W)+P(R)\\\\=(4)/(40)+(16)/(40)\\\\=(20)/(40)=(1)/(2)`