Probability / sets, plotting P(A' | B') on Venn diagram

[modern lantern]

They've done this question using the analytical method, which I understand.
I tried to do this by plotting values on a Venn diagram, and got it wrong. Venn diagram given below.

[light citrus]

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[modern lantern]

I thought A' | B' is = the outer region (1 - union of A and B)

which yields 5/12, but that's wrong

I thought that cuz if you imagine reducing the subset to B', then A' given B' is just the outer region right

this is the real answer, in which they've divided the answer that I got by P(B')

while it seems obvious that P(A' | B') wont just be P(A' intersection B'), where am i going wrong in the Venn diagram approach?

[haughty panther]

Venn diagram also gives the same ig

[modern lantern]

yeah that why'd you divide by 2/3

by P(B') i mean

i thought it was just 5/12 via venn diag

[haughty panther]

Because it is given P(B') has already occured.

Which means what you consider is the universal set is now basically B'

[modern lantern]

OH

[haughty panther]

Which means that probability of all the portion inside the B' get scalled by 3/2

[modern lantern]

ahhhhhhhhhhh

[haughty panther]

Because now P(B'|B')=1

[modern lantern]

shi that's cool

thank u

[haughty panther]

Np.

[modern lantern]

+solved SirLancelotDuLac