In Try This 3 the coach must choose a centre and a right wing and a left wing and two defence. By using the fundamental counting principle, you multiply the number of choices for each position to determine the total number of ways to make these choices.
The total number of ways the coach can choose the first line is 5 × 7 × 6 × 45 = 9450 ways.
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If you want to see another example of a combination question with extra conditions, read through the rest of “Example 1” on pages 530 and 531 of the textbook.