True fans will know that only SSB melee is viable for competitive :P Nintendo slowed everything down (a lot) since melee because they intended it to be a "family game" not a competitive game.
i) Choose 3 people to sit on the 3-seat-table. Then arrange both groups accordingly. 8C3 x 2! x 4!
ii) 1 - P(couple sit together) = 1 - [ P(both on 3-seat-table) + P(both on 5-seat-table)]
= 1 - [ (6 x 2! x 4!) + (6C3 x 4! x 2!) ] /(result from i)
Someone pointed out before that the examiners who set the MX2 paper have no affiliation with the examiners who set the MX1 paper. If this is true then stop trying to infer :P
You are misunderstanding cause and effect. Q8: Graph gives you that as temperature decreases, pH increases (this is the effect). Now you have to find the cause - so 8 is B (it must have become less ionised and H+ concentration decrease)