157. 15663-!-item-!-187;#058&010465
If n is a positive integer and r is the remainder when 4 + 7n is divided by 3, what is the value of r ?
(1) n + 1 is divisible by 3.
(2) n > 20
ANS: (A)
常常搞不懂餘數的題目~請問有哪位大大可以教一下呢?? 謝謝
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