Jawaban:
C. 3
Penjelasan dengan langkah-langkah:
1! = 1 = 1
2! = 2 x 1 = 2
3! = 3 x 2 x 1 = 6
4! = 4 x 3 x 2 x 1 = 24
5! = 5 x 4 x 3 x 2 x 1 = 120
:
Setiap faktorial setelah angka 5, pasti digit terakhir alias satuannya yaitu 0
Maka
1! + 2! + 3! + 4! + .... + 2005!
= 1 + 2 + 6 + 4 + .... + 0
= 3
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Jawaban:
C. 3
Penjelasan dengan langkah-langkah:
1! = 1 = 1
2! = 2 x 1 = 2
3! = 3 x 2 x 1 = 6
4! = 4 x 3 x 2 x 1 = 24
5! = 5 x 4 x 3 x 2 x 1 = 120
:
:
Setiap faktorial setelah angka 5, pasti digit terakhir alias satuannya yaitu 0
Maka
1! + 2! + 3! + 4! + .... + 2005!
= 1 + 2 + 6 + 4 + .... + 0
= 3