Gamma gamma gameleon

Calculus Level 3

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

(s1)!0etts1dt?(s-1)! \equiv \int_{0}^{\infty} e^{-t}t^{s-1} \, dt\, ?

A. \ Integration by parts
B. \ U-substitution
C. \ Induction

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