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jmc

counting and probability junior

Problem

Compute

(8 9)

.

Solution

(8 9) = \frac{9 !}{8 ! 1 !} = \frac{9 \times 8 \times 7 \times 6 \times 5 \times 4 \times 3 \times 2}{8 \times 7 \times 6 \times 5 \times 4 \times 3 \times 2 \times 1} = 9

.

Final answer

9