Samar

Check this out

Hi there, I'm just curious to know something. I wasn't allowed to comment in politics section.Is this forever or till I get a definite number of posts or what? Thanks.

I'm afraid your solution manuals is correct. This is the Venn diagram of your problem. What you want to do is to say P© without that region of intersection with A alone,B alone + the region of intersection of three circles.Right? but when you say [math]P(A \cap C)[/math] you refer to the region in which A intersects C alone + that one in which the three circles intersect with each other. And when you say [math] P(B \cap C) [/math] you also refer to the region in which B intersects with C alone + that one in which the three circles intersect. If you added both values to each other with negative before them you'd be saying:It's the probability of C without regions of intersecion with A alone + B alone + 2 times the region of intersection of three circles. That's why you compensate that by adding [math]P(A \cap B \cap C)[/math] with positive before it at the end of the equation. I hope this helped

It's strange that 20 years now and even the most basic results of these experiments are not confirmed or are said to be "Nearly ...." or simply depends.