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What value is assigned to zero factorial?
AOne
BSix
CTen
DTwo
Answer & Solution
Correct answer: A. One
1. Zero factorial is fixed by definition, not by multiplying anything.
2. The value is chosen so the permutation formula works when r equals n.
3. So zero factorial is defined to be one.
_Source: NCERT Class 11 Mathematics, Ch 6 'Permutations and Combinations'_
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