Three of them are chosen at random. what is the probability that the three lines can form a triangle.
更新1:
the answer is wrong, answer=3/10 but i don't know why
maths!!!!!!
2009-02-04 11:57 pm
consider five lines of different lengths 2,6,10,14,18
Three of them are chosen at random. what is the probability that the three lines can form a triangle.
Three of them are chosen at random. what is the probability that the three lines can form a triangle.
回答 (1)
2009-02-05 1:31 am
✔ 最佳答案
C(5,3)=102,6,10==>WRONG
2,6,14==>WRONG
2,6,18==>WRONG
2,10,14==>WRONG
2,10,18==>WRONG
2,14,18==>WRONG
6,10,14==>RIGHT
6,10,18==>WRONG
6,14,18==>RIGHT
10,14,18==>RIGHT
SO =3/10
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