First little piggy is 25% likely to go to market if second little piggy goes. Second little piggy is 50% likely to go to if first little piggy goes. Sadly at least one of them must go to market. How likely are they both to go?
So far i have:
Let A = First little piggy goes to market
B = Second little piggy goes to market
P(A given B) = 0.25
P(B given A) = 0.5
P(A union B) = P(A) + P(B) - P(A intersection B)
Is the P(A union B) = 1 as atleast one must go, so this is always true?
Does anyone have any ideas, i'm really stuck.