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1!=1
4!=1*2*3*4=24
5!=4!*5=120
1+24+120=145
1! --> bez zmian 1
4! --> 1 · 2 · 3 · 4 = 24
5! --> 1 · 2 · 3 · 4 · 5 = 120
Czyli :
1 + 24 + 120 = 145 <-- Prawda