We have four boxes, each of which contains 10 coloured balls:

• Box 1 contains 4 red balls, 5 green balls and 1 yellow ball.
• Box 2 contains 3 red balls, 5 green balls and 2 yellow balls.
• Box 3 contains 2 red balls, 5 green balls and 3 yellow balls.
• Box 4 contains 1 red ball, 5 green balls and 4 yellow balls.

If we randomly select one ball from each box, what is the probability of selecting at least one yellow ball?

Seleccione una:

a. 0.7 b. 0.5

c. 0.6 d. 0.9 e. 0.8