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#1
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¾ÔÊÙ¨¹ì Êٵà Factorail µÑǹÕéãËé˹èͤÃѺ
0!+1!1+2!2+3!3+4!4+5!5+...+n!n = (n+1)!
ËÒäÁèà¨Í ú¡Ç¹´éǹФÃѺ |
#2
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1!1 = 1!(2-1) = 2! - 1!
2!2 = 2!(3-1) = 3! - 2! 3!3 = 3!(4-1) = 4! - 3! .... àÍÒÁҺǡ¡Ñ¹ ·Ñé§ËÁ´ ¹èÒ¨Ðä´éÅйР|
#3
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¢Íº¤Ø³ÁÒ¡àŤÃѺ·èÒ¹ÍÒ¨ÒÃÂì
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