(nm)!/ (n!)**m
1*2*3..... *n* (n+1) *... (2n)... (3n)..... (mn) / (1*2*3..... *n) * (1*2*3..... *n) ......
令 1*2*3..... *n = nf
上面式子 = nf*(n+1) ..... (2n)*(2n+1)*(2n+2)* (2n+3) .......
e
上面式子 = nf*(n+1)....* 2(nf*)*(2n+1)*(2n+3) ... *3(nf)
上面式子 / (nf)** m = (n+1) .......(2n-1) * 2 * (2n+1) (2n+3) ... * 3*(3n+1)*(3n+2)*(3....
整數之成積 故為整數
1 .................n .................2n .................3n .................4 mn
(11*13*15 -9)/2 = I-min
2( I-min) mod 11 = 11-9 =2
( I-min) mod 11 = (11-9)/2 =2/2 =1
(11*13*15 -9)/2 = I-min
2( I-min) mod 13 = (13-9) = 4
( I-min) mod 13 = (13-9)/2 =4/2 =2
(11*13*15 -9)/2 = I-min
2( I-min) mod 15 = (15-9) = 6
( I-min) mod 15 = (15-9)/2 =6/2 =3
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※ 編輯: ott 時間: 2014-01-04 05:06:05
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