Sum
Evaluate : `("n"!)/("r"!("n" - "r")!)` for n = 12, r = 12
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Solution
n = 12, r = 12
∴ `("n"!)/("r"!("n" - "r")!) = (12!)/(12!(12 - 12)!)`
= `(12!)/(12! 0!)`
= 1 ...[∵ 0! = 1]
Concept: Factorial Notation
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