Gamma gamma gameleon

Calculus Level 3

Which of the following is/are used in the derivation of

\[(s-1)! \equiv \int_{0}^{\infty} e^{-t}t^{s-1} \, dt?\]

\( \quad \text{A: Integration by parts} \\ \quad \text{B: U-substitution} \\ \quad \text{C: Induction} \)

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