十种颜色粉刷房间，每个房间搭配三种颜色，那么十种颜色可以粉刷出42种不同颜色的房间吗？
Therearemanycolorcombinationsusedindecoratinghomes.Would10colorsbeenoughtodifferently...
There are many color combinations used in decorating
homes. Would 10 colors be enough to differently color 42 rooms, if colors are
chosen 3 to a room?
Answer
a.
No, only 4 rooms
b.
No, 50 rooms
c.
Yes, 126 rooms
d.
Yes, 120 rooms 展开
homes. Would 10 colors be enough to differently color 42 rooms, if colors are
chosen 3 to a room?
Answer
a.
No, only 4 rooms
b.
No, 50 rooms
c.
Yes, 126 rooms
d.
Yes, 120 rooms 展开
1个回答
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这题给我的感觉好像就是求组合数啊，C（10,3）=10×9×8÷（1×2×3）=120，选D
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