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第一個:4第二個:12第三個:24第四個:40第一個是1+1+1+1,N連+4次第二個是2+2+2+2+2+2,N連+6次以此類推,第三個為N連+8次,得24由此是地幾個數就連+某次.第一個是連4,第二個連6,第三個連8,由此得:地N個數為:(2N+2)N
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