Re: [計量] 印度網站數學 September 23rd
※ 引述《Mice (Mice)》之銘言：
: http://ppt.cc/9M,g
: 7. B
On a particular day 'X' number of people go to the post office. Of them,7
people mailed letters, 9 people buy stamps and 10 people mailed packages but
didn't buy stamps or mail letters.
Col A : The number of people who buy stamps and mailed letters
Col B : The number of people who mailed packages but didn't buy stamps or
mailed letters
因為題目有特別說10 people是只有mailed package而沒mailed letters和buy stamps
那是不是7 people和9 people就可能除了mailed letters和buy stamps外
7 people還可以buy stamps 而9 people還可以mailed letters
還是我多想了 ><
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