On a fair spinner,the probability of spinning blue 1/3.The probability of spinning blue or green is 1/2.What is probability of spinning green?

Question

sandra · Answer

this is a mutually exclusive probability problem

sandra · Answer

i.e. it's impossible for both events to happen at the same time

anonymous · Answer

yeea i know

sandra · Answer

and hence we know that P(A or B) = P(A) + P(B)

sandra · Answer

so P(B or G) = P(B) + P(G)
1/2 = 1/3 + P(G)
1/2 - 1/3 = P(G)
3/6 - 2/6 = 1/6 = P(G)

sandra · Answer

so probability of green is 1/6

anonymous · Answer

oh i have more quesitons

sandra · Answer

I'd say ask them separately? that way in case I can't answer it people won't think it's already been answered.

anonymous · Answer

oh