問題詳情
67. 如圖，數字1~12的位置恰好將圓周分成12等分，今將圓周上的質數(例如2與3)以線段連接起來，共可形成a 條線段。已知圓O 的半徑為1，且這a 條線段會有b 種不同的長度，則 a+b=？
(A)14
(B)15
(C)16
(D)17 
參考答案
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