help pleaseee

Question

help pleaseee

zarkam21 · Answer

attachment

shreehari499 · Answer

Hi there! 
P(A and B) = P(A) + P(B) - P(A U B)

shreehari499 · Answer

Now try it..

anonymous · Answer

So complicated o.O 
Maybe you should let me handle this shreehari :>

zarkam21 · Answer

well P(a) + P(b) is equal to 1.3

anonymous · Answer

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)

anonymous · Answer

Let's just look at the pretty circles :D|dw:1440769110134:dw|

zarkam21 · Answer

Okay :]

anonymous · Answer

If this represents A|dw:1440769131263:dw|

anonymous · Answer

And this represents all that is B|dw:1440769176496:dw|

anonymous · Answer

Which part of this drawing do you think is both A *and* B ? ^^

zarkam21 · Answer

The middle part where the two circles intersect.

anonymous · Answer

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 ^^

zarkam21 · Answer

Yup :] So it would be 0.5 +0.8 -0.3 ?

anonymous · Answer

No.  Just the part in the middle of the two circles, you said :)

anonymous · Answer