MobileRead Forums - View Single Post

Billi · 06-19-2011, 02:59 AM

3
Beginning with 5! every factorial ends with 0, so you only have to add 1! + 2! + 3! + 4! (1+2+6+24 = 33).

06-19-2011, 02:59 AM	#3195
Billi Wizard Posts: 3,388 Karma: 14190103 Join Date: Jun 2009 Location: Berlin Device: Cybook, iRex, PB, Onyx	3 Beginning with 5! every factorial ends with 0, so you only have to add 1! + 2! + 3! + 4! (1+2+6+24 = 33).