The probability that Tony joins the Music club is 0.2 and the probability that he joins the Science club is 0.15. If the probability that he joins both clubs is 0.02, find the probability that he joins at least one of the clubs.

@ganeshie8

Question

The probability that Tony joins the Music club is 0.2 and the probability that he joins the Science club is 0.15. If the probability that he joins both clubs is 0.02, find the probability that he joins at least one of the clubs.

@ganeshie8

anonymous · Answer

@nubeer

marigirl · Answer

have u got a final answer to compare to?

anonymous · Answer

answer: 0.33

marigirl · Answer

I think I have a fair idea.
Lets do P(A)=0.2 (Music)

marigirl · Answer

I think I have a fair idea. 
Lets do 
P(A)=0.2 (Music)
P(B)=0.15 (science)
P(A and B)=0.02 (both)

marigirl · Answer

now we want to find the probability that he joins at least ONE of the clubs. note that this is referring to P(A) the music club or the P(B) Science... but we dont want to calculate the prob of him joining both

anonymous · Answer

0.2+0.15-0.02?

marigirl · Answer

so we can do
P(A or B) = P(A)+P(B)-P(A and B)

marigirl · Answer

as kryton1212 pointed out too

anonymous · Answer

i understand now, thank you:)

marigirl · Answer

oh wait that was you.. awkward. ...lol

anonymous · Answer

haha, i have another questions. Can you teach me?

marigirl · Answer

okay ill try.

only4u · Answer

its ( 0.2+0.15)-0.02=0.33