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:  $\dfrac{1}{2}$

Step-by-step 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 =$P(W)=\dfrac{4}{40}$

The probability of drawing red marble =$P(R)=\dfrac{16}{40}$

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

$P(W)+P(R)\\\\=\dfrac{4}{40}+\dfrac{16}{40}\\\\=\dfrac{20}{40}=\dfrac{1}{2}$