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How many different ways can a psychology student select 5 subjects from a pool of 20 subjects and assign each one to a different experiment?

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Answer to a math question How many different ways can a psychology student select 5 subjects from a pool of 20 subjects and assign each one to a different experiment?

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Jon

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$\frac{ 20 \times 19 \times 18 \times 17 \times 16 \times 15 ! }{ \left( 20-5 \right) ! }$

$\frac{ 20 \times 19 \times 18 \times 17 \times 16 \times 15 ! }{ 15 ! }$

$20 \times 19 \times 18 \times 17 \times 16$

$\begin{align*}&1860480 \\&1.86048 \times {10}^{6}\end{align*}$

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