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2!= 1x2=2
3!=1x2x3=6
4!=1x2x3x4= 24
5!=1x2x3x4x5= 120
6!=1x...x6= 720
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2014!= digit terakhir pasti 0
jadi tinggal dijumlahkan digit terakhir dari 1!+2!+3!+4!= 1+2+6+4 = 13
jadi digit terakhi dari 1!+2!+3!+...+2014! = 3