[計量] 請問數學"uvrs&t"
Given a table with some variables as 'u','v','r','s'&'t' whose product
is even and also it is given that product of 'uvrs' & 'uvr' as even and
product of 'rs' as odd. Which of the following options cannot be odd?
A)r
B)s
C)t
D)u
E)v
Ans:C
題目意思第一段不太確定，
是uvrst相乘為偶數嗎？
如果是這樣何者不能為奇數應該選u或v吧？
不懂為什麼變成選t？
可否請教一下大家，謝謝:)
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