What's the Exclamation Mark for?

Algebra Level 4

3!1!+4!2!+5!3!++50!48!= ?\Large \frac {\color{#20A900}3!}{\color{#BA33D6}1!} + \frac{\color{#20A900}4!}{\color{#BA33D6}2!} + \frac{\color{#20A900}5!}{\color{#BA33D6}3!} + \dots + \frac {\color{#20A900}{50}!}{\color{#BA33D6}{48}!} = \ \color{#3D99F6}?

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