# Solve It 10

Level pending

$$\text{If}\quad \\ f\left( 21 \right) \quad =\quad 2\\ f(83)\quad =\quad 336\\ f(91)\quad =\quad 9\\ f(65)\quad =\quad 720\\ f(95)\quad =\quad 15120\\ Then\quad find\quad the\quad value\quad of\quad f(72)\\$$

This is a logical rule not a mathematical function.

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