問題詳情
7. 設「 
」代表大於 a 且小於 b 所有質數的個數。例如：大於 10 且小於 15 的質數有 13 兩個質數，故 10 
15＝2。若 20 
c＝2，則 c可能為下列哪一個數？
(A)27
(B)29
(C)31
(D)32
參考答案
答案：C
難度：計算中-1
書單：沒有書單，新增
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