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For a I have to use the formula: P(A) + P(B) - P(A n B) =

|dw:1346193475482:dw|

|dw:1346193785276:dw|

yeah i see that now.

|dw:1346193816687:dw|

for b, do i take 37 + 79 and then subtract 82?

or am i off?

I think you should just take the complement of your answer to A.

66% of houses have either a pool or a garage, so (1-0.66) = 0.44 will have none of these.

that's not it

i am given this formula though:
P(A)=1-P(A^c)

Yeah, so 1-P(A)' = P(A), and this works the other way. 1-P(A) = P(A)'

it's 0.34. you subtracted wrong.

Haha oh dear, more coffee required. Sorry. Do you get the idea though?

My advice is to get the hang of drawing those Venn Diagrams. They are really helpful.

can you help me with part c too?

hello?

This area, right? |dw:1346194888234:dw|

yeah

is it 0.21-0.18?

:)

sweet :)