Mathematics
Senior High
数Aの組合せの問題です。なぜの総数を求めるために〜階乗分の〜階乗という様に割るのでしょうか？
!
よって, 求める最短の道順の総数は
9!
9・8・7･6
5!4!
4･3･2･1
A
=126(通り)
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