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Do one through four and I'll name a fish after you

Do one through four and I'll name a fish after you-example-1

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1.P(n,r)=P(5,3)=5!(5−3)! = 60 2.P(n,r)=P(12,3)=12!(12−3)! = 1320 3.n! = 8!
4.n! = 13!
= 6.2270208 E+9 = 40320


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