Problem

Evaluate $_{9} P_{3}$

Answer

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Answer

$_{9} P_{3} = 9 \times 8 \times 7$

Steps

Step 1 ： $_{9} P_{3} = \frac{9!}{(9 - 3)!}$

Step 2 ： $_{9} P_{3} = \frac{9!}{6!}$

Step 3 ： $_{9} P_{3} = 9 \times 8 \times 7$

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