[計量] 數題數學
這是http://www.greguide.com裡面Q的第三回練習
但是有好幾題我不太懂。
1. Sunita wants to make a necklace. She has 8 beads. How many different
choices does she have?
ans: 1200
2. On a chess board one white square is chosen at random. In how many ways can
a black square be chosen such that it does not lie in the same row as the
square?
ans: 2002
3. There are 15 points in a plane, out of which 6 are collinear. How many
pentagons can be drawn with these points?
ans: 2997
我算是2142
謝謝大家不吝給予指教!
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7年前
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