alleryZero factorial is defined as which value?
AFive
BNine
COne
DFour
Answer & Solution
Correct answer: C. One
1. Factorial is defined as a product, and an empty product needs a value.
2. The value is fixed by definition rather than derived.
3. Zero factorial is defined to be one.
4. That convention makes the later formulas work at the edges.
_Source: syllabus Mathematics, Ch 6 'Permutations and Combinations'_
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