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I have this $Pr(a\cap h^c)$, so i believe that I can say $Pr(a\cap 1-h)$ is that true?

The solution has this:

$Pr((a\cap h^c)$ = $(a-h)$ = $(a-(a \cap h))$

So, if what I have is true, how can I go for $Pr(a\cap 1-h)$ to $(a-(a \cap h))$?

I was kind of hoping in the solution can be explained, or if any links where I would be able to see that the solution works as well as others so that I can review what I have forgotten over the years.

Thank you.