<p>I'll explain briefly how you come up with the answer.</p>

<p>How many different combinations of 2, can be found in a group of 8? I won't trouble you with the thought. Simply bring your FX calculator, and press '8', followed by 'Shift' and then the 'divide' sign on the calculator (you'll notice that there's a letter 'C' under it), so now your calculator has the following written on its screen "8C". Good. How many combinations do we want in 8 again? 2. OK, so press 2 on the calculator. You now have "8C2". Press Equal. It gives you a total of 28 combinations. Since each 2 teams played a total of 4 matches, and not 1, we'll be multiplying 28 by 4 to give the correct answer of 112.</p>