[計量] OG12 DS #170
If n is a positive integer, is n^3 - n divisible by 4 ?
(1) n = 2k + 1, where k is an integer.
(2) n^2 + n is divisible by 6.
Ans. (A)
可是
當 k = 0 的時候,
n^3 - n = 0 ,
是說 0 / 4 = 0 → 表示被除盡嗎
謝謝！
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