Oh, I get No.2 now... I thought it also wanted to take into account the 3 others in between the first and last, but now it makes sense. Thanks for No.3, that makes sense. And I think for No.4, it's asking what the probability of getting 3 heads in a row is... You can either get 3 h's then 3 t's, or 1 t then 3 h's then 2 t's, 2 t's then 3 h's then 1 t, or 3 t's then 3 h's. I know I'd have to find the P of each case then add them up, but I don't know how to take the orders into account.
Thanks a lot. 
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I have my own particular sorrows, loves, delights; and you have yours. But sorrow, gladness, yearning, hope, love, belong to all of us, in all times and in all places. Music is the only means whereby we feel these emotions in their universality. ~H.A. Overstreet
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