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Hi there! P(A and B) = P(A) + P(B) - P(A U B)
Now try it..
So complicated o.O Maybe you should let me handle this shreehari :>
well P(a) + P(b) is equal to 1.3
The thing is, P(A U B) is not given or at least, not explicitly. U means or, btw So actually, P(A and B) = P(A) + P(B) - P(A or B)
Let's just look at the pretty circles :D|dw:1440769110134:dw|
If this represents A|dw:1440769131263:dw|
And this represents all that is B|dw:1440769176496:dw|
Which part of this drawing do you think is both A *and* B ? ^^
The middle part where the two circles intersect.
That's right :D|dw:1440769491252:dw| See? All you need was a little imagination ^^ That's why P(A and B) can also be written as \[\Large P(A\cap B)\]which is also read as probability of A *intersected* with B Good job ^^
Yup :] So it would be 0.5 +0.8 -0.3 ?
No. Just the part in the middle of the two circles, you said :)
|dw:1440769708337:dw| |dw:1440769721954:dw| |dw:1440769732308:dw| |dw:1440769790036:dw|
So just 0.3?
thats the answer?
Lol after all that work, it was as simple as that? :P Thanks anyways :]