配套习题- 直接法解排列组合问题 -【青果学院】

1/3单选题

难度：

1.用0，1，…，9十个数字，可以组成有重复数字的三位数的个数为(　　)

A	366
B	252
C	250
D	125

正确答案：Qg==

6Kej77ya5qC55o2u5YiG5q2l5LmY5rOV6K6h5pWw5Y6f55CG77yM55SoMO+8jDHvvIzigKbvvIw55Y2B5Liq5pWw5a2X57uE5oiQ55qE5LiJ5L2N5pWwKOWQq+aciemHjeWkjeaVsOWtl+eahCnlhbHmnIk5w5cxMMOXMTA9OTAw77yM57uE5oiQ5peg6YeN5aSN5pWw5a2X55qE5LiJ5L2N5pWw5YWx5pyJOcOXOcOXOD02NDjvvIzlm6DmraTnu4TmiJDmnInph43lpI3mlbDlrZfnmoTkuInkvY3mlbDlhbHmnIk5MDDvvI02NDg9MjUyLiA=

2/3单选题

难度：

2.将A，B，C，D，E，F六个字母排成一排，且A，B均在C的同侧，则不同的排法共有　　　　种(用数字作答).

A	480
B	240
C	960
D	120

正确答案：QQ==

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

3/3单选题

难度：

3.用红、黄、蓝等6种颜色给如图所示的五连圆涂色，要求相邻两个圆所涂颜色不能相同，且红色至少要涂两个圆，则不同的涂色方案种数为（）

A	630
B	610
C	670
D	690

正确答案：QQ==

6Kej77ya6YeH55So5YiG57G75Y6f55CG77ya56ys5LiA57G777ya5raC5Lik5Liq57qi6Imy5ZyG77yM5YWx5pyJPGltZyB3aWR0aD0yNjAgaGVpZ2h0PTMyIHNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvNUQvOEQvckJBQ0UxTl9CN3pBSEM1UEFBQUZjcUE5S2hrNzgxLnBuZyI+56eN77yM56ys5LqM57G777ya5raC5LiJ5Liq57qi6Imy5ZyG77yM5YWx5pyJPGltZyB3aWR0aD03NyBoZWlnaHQ9MzIgc3JjPSJodHRwczovL3AxLnFpbmdndW8uY29tL0cxL00wMC8yMS85Qi9yQkFDRkZOX0I3eWpDVVYzQUFBQzA5bHc4d001NzYucG5nIj7np43vvJvmlYXlhbHmnIk2MzDnp40u44CC