Re: [計量] 請教一下題目
A: 1/3 damaged
B: 2/3 cracked
Intersection of AB : 1/3 cracked and damaged
Union of AB : A + B - AB = 1/3 + 2/3 - 1/3 = 2/3
Let X: total numbers of plates
X[ 1 - ( 1/3 + 2/3 - 1/3 ) ] = 80
X = 240
※ 引述《nihil (喔)》之銘言：
In the pack of plates, 1/3 plates are damaged, 2/3 plates are cracked and 1/3
of them are damaged and cracked. If 80 are not hampered, then what is the
number of total plates?
在360個盤子裡面 damaged的是120個, cracked的240個,既damaged又cracked的80個
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若照您的算法, damaged 120 = 1/3 of 360
cracked 240 = 2/3 of 360
damaged and cracked 80 =\= 1/3 of 360
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