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一條直線兩分二條直線4份三條直線7份四條直線11份規律是每次分別新增2.3.4.因為每次都要與已有的所有直線都相交,每次新增的數目就是第n條的那個n這樣可以用等差數列求和來算,第一次視為1+1第二次視為1+(1+2)第三次…
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