May 11, 2015Β Β· While 1/i = iβˆ’1 1 / i = i 1 is true (pretty much by definition), if we have a value c c such that cβˆ—i = 1 c βˆ— i = 1 then c= iβˆ’1 c = i 1. This is because we know that inverses in the. Possible Duplicate: Prove 0! = 1 0! = 1 from first principles Why does 0! = 1 0! = 1? All I know of factorial is that x! x! is equal to the product of all the numbers that come before it. The product.

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