there are 3 male and 3 female volunteers.Now send 2 men and

There are 3 male and 3 female volunteers。Now send 2 men and a woman to different 3 places。志愿者有 3 男 3 女。现在要将 2 男 1 女送去 3 处。There are ( ) ways to send them。有( )种方法。Key:fifty four。五十四。若男 ABC 女 abc可这么分组：a ABa BCa ACb ABb BCb ACc ABc BCc AC共 9 种。派去三个地方,设为 x y z。可排列为：xyzxzyyxzyzxzxyzyx共六种。6*9=54。或者：C(2)(3)C(1)(3)*A(3)(3)=54 再问： In the following regular pentagon,a frog just point A,every time he can just to one of next 2 points, it stopped when jumped to point D。there are ( ) jumping way when the frog jump to point D with 5 times。(include 5 times)