A box contains 3 red balls, 5 white balls, and 10 green balls. If a ball is chosen at random what is the probability that it is either white or green?
A. 5
B. 3/10
C. 5/6
D. 1/2

Question

A box contains 3 red balls, 5 white balls, and 10 green balls. If a ball is chosen at random what is the probability that it is either white or green?
A. 5
B. 3/10
C. 5/6
D. 1/2

anonymous · Answer

18 balls in total

anonymous · Answer

15 balls that are either white or green

anonymous · Answer

...

anonymous · Answer

Right I am thinking it is C but I just want to double check probability is not my strong point

anonymous · Answer

P(W or G)= P(W)+P(G)-P(W and G)

since a ball can't be both, P(W and G)=0 (mutually exclusive events).

anonymous · Answer

Yes i believe you're correct

anonymous · Answer

what's P(W)?

anonymous · Answer

15/18 = 5/6

igreen · Answer

10 Green Balls

5 White Balls

10 + 5 = 15

18 in total.

15/18 = 5/6

anonymous · Answer

1-P(W or G) = P(R) = 1- 3/18 = 1 - 1/6 = 5/6