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2!=2.(1!)=2
3!=3.(2!)=6
4!=4.(3!)=24
5!=5.(4!)=120
ingat rumus n!=n.(n-1!)
pada 1!=1 .(0!)=1
0!=1/1=1
nPn=n! / (n-n)!=n! / 0!
n!= n! / 0!
0!=n! / n! = 1
0!=1
bener?