[計量] 幾題數學
1.
How many different differences can be obtained by taking only two numbers at a
time from 3,5,2,10 and 15?
答案是1440
不過我看不太懂題意 XD
2.
In a class test there are 5 questions. One question has been taken from each
of the four chapters. The first two chapters have 3 questions each and the
last two chapters have 6 questions each. The fourth question can be picked
from any of the chapters. How many different question papers could have been
prepared?
答案是4860
可是不知道是怎麼來的...
謝謝!
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