[問題] 請問2題數學
If n is a positive integer and r is the remainder when (n-1)(n+1) is divided
by 24, what is the value of r?
1). n is not divisible by 2
2). n is not divisible by 3
答案是C 可是我推不出來
(1)能知道N是奇數 所以 (n-1)(n+1)/24 ??好像求不出來
(2)只知道N不是3的倍數
請問同時考慮 該怎麼想
還有一題好像是去年的JJ題
The remainder when positive integer n is divided by 2,3,4,5 or 6 is 1 ,and n
is divisible by 7 what is the least value of n??
請問這題該怎麼算
謝謝
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