Erwin Harahap

do Now or Never

Dalam berapa cara 5 surat dapat dikirimkan apabila tersedia 3 kotak surat ?

Posted by Erwin on September 8, 2015

Jawab:

Gunakan permutasi

P(5,3)=\frac{5!}{(5-3)!}
=\frac{5*4*3*2!}{2!}
=60 cara

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