Equation Involving Permutation

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I love the way you teach sir
I understand alot now 😮

BlessingOkafor-gdcu
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Please how did you come to subtract n from 1 from n factorial

JojinoAshi-dl
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Hello Mr tambuwal I'm one of your biggest fans ❤️

solomonjoseph
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I have a question. Why is the answer of the question 8 and not -9?

adesolaadebayo