If r is the remainder when the positive integer n is divided by 7, what is
the value of r?
(1) When n is divided by 21, the remainder is an odd number
(2) when n is divided by 28, the remainder is 3
這題我看網路解法還是不是很懂
但我後來想想 他是問說r=?
只有B有給出r=3 而A沒有給出明確答案
所以選B嗎?
畢竟n也沒有寫多少!!!
可以這樣理解嗎??