Ajar contains 3 red, 4 blue, and 5 white marbles. Which of the following is the probability of drawing either a red or a

white marble?

2/3

Step-by-step explanation:

Total number of marbles = 3 + 4 + 5 = 12

Pr (red marble) 3/12

Pr (Blue marble) = 4/12

Pr (white marble) = 5/12

Probability of drawing either a red or a white marble

= Pr (red) + Pr (white)

= 3/12 + 5/12

= 8/12

= 2/3