若 A 是一個九進位的四位數，其四個數字由左到右為 abcd，則判斷 A 是否為 3的倍數的方法是：(A)若 d 是 3 的倍數，則 A 也是 3 的倍數(B)若 a＋b＋c＋d 是 3 的倍數

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4. 若 A 是一個九進位的四位數，其四個數字由左到右為 abcd，則判斷 A 是否為 3的倍數的方法是：
(A)若 d 是 3 的倍數，則 A 也是 3 的倍數
(B)若 a＋b＋c＋d 是 3 的倍數，則 A 也是 3 的倍數
(C)若(a＋c)－(b＋d)是 3 的倍數，則 A 也是 3 的倍數
(D)以上皆非

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