you walk into a room. on the bed, there 2 dogs, 4 cat, a girrafe, 5 cows and a duck. there are also three chickens flying above the bed. how many legs are on the floor ?

50 legs

Step-by-step explanation:

We know that a dog has 4 legs, a cat has 4 legs, a giraffe has 4 legs, a duck has 2 legs, and a chicken has 2 legs. So, we want to calculate , right?

Wrong! It's a trick question! The chickens aren't on the floor, so they don't count. So, we really want .

We multiply it out to get .

We add these up to get .

So, our answer is legs.

use this formula:

p(a\b) = p(a and b)/p(b).

take it from here.