In a certain lottery, 5 numbers between 1 and 13 inclusive are drawn. These are the winning numbers. How many different selections are possible? Assume that the order in which the numbers are drawn is not important.

Because the order of the 5 winning numbers does not matter, use combinations: choose 5 numbers from 13. The calculation is 13C5 = (13 × 12 × 11 × 10 × 9) ÷ (5 × 4 × 3 × 2 × 1) = 1,287. The correct choice is 1,287.

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