[計量] PP1-DS 159

[humid (深藍)]

本人對於餘數的問題常常搞不懂= =


If n is a positive interger and r is the remainder when
(n-1)(n+1)is divide by 24,what the value of r?
(1)n is not divisible by 2
(2)n is not divisible by 3

Ans:C


請牛牛們指點一下
謝謝囉

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推 DreamKite:建議你用窮舉法,考試時間沒辦法讓你快速寫答案
→ DreamKite:A or B or C(AB交集) 每個都舉兩個例子就可以得證^^
推 Chest:請參考拙作#19aNBPCz，就是在討論這一題