(2n-1)24... (2n)B 3421 C 2413... (2n-1)24... (2n)

(2n-1)24... (2n);（6）13... (2n-1)(2n)(2n-2)... 2.按自然数从小到大为标准次序，求下列排列的逆序数：（1）1234;

(2n-1)24... (2n) 的逆序数,并讨论其奇偶性.

(2n-1)24 ... (2n); (6)13 ... (2n-1)(2n)(2n-2) ... 2.2.按自然数从小到大为标准次序，求下列各排列的逆序数：

按自然数从小到大为标准次序，求下列排列的逆序数：(1) 1234；(2) 4132；(3) 3421；(4) 2413；(5) 13...(2n-1)24...

(2n-1)... (2n);(6)13 ... (2n-1)(2n)(2n-2)... 2.2.按自然数从小到大为标准次序，求下列排列的逆序数：(1)1234

(2n-1)24... (2n);-|||-(6) ... (2n-1)(2n)(2n-2)... 2.-|||-3.写出四阶行列式中含有因子a11a 23的项

(2n-1)24... (2n) ;-|||-(6) ... (2n-1)(2n)(2n-2)... 2.-|||-3.写出四阶行列式中含有因子a11a23的项

(2n-1)24... (2n);-|||-(6) ... (2n-1)(2n)(2n-2)... 2.-|||-3.写出四阶行列式中含有因子a11a 23的项

(2n-1)(2n)(2n-2)... 2 -

(2n-1)246... (2n)求下列全排列的逆序数。（1）634521（2）53142（3）54321（4）