There is a bag with 15 yellow items and 15 blue items. One of them is the pen of blue color. Suppose that you grab one item from it. The preposition A defines the blue pen and preposition B defines blue items. Which ones are correct: 1) p(B)=p(B|A); 2) p(B)>p(B|A); 3) p(B)p(A|B); 6)p(A)