Recent content by isabelle york

I've managed to do 3(a), it is false. I used the counter example: A= a, B= b, C = a, b. How do I do 3(b)? 3(b) is 3(a) reversed. I'm pretty sure 3(b) is true since the RHS will always end up being 'larger', but i don't know how to go about proving it. EDIT: ignore my reasoning in the OP, I...

how do I go about doing 3(a) and 3(b)? I'm guessing that for 3(a), it is true, since we have for LHS: P((A or B) and C) we can consider the case P(A and C) by excluding B, and this is a subset of the RHS when we also exclude B: (P(A) and P(C)). We can consider excluding B because...