观察下面几组数:1,3,5,7,9,11,13,15,...2,5,8,11,14,17,20,23,...7,13,19,25,31,37,43,49,...这三组数具有共同的特点.现在有上述特点的一组数,第一个数是3,第三个数是11,则第n个数为( )(A)8n-1 (B)n²+2 (C)4n-1 (D)2n
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![观察下面几组数:1,3,5,7,9,11,13,15,...2,5,8,11,14,17,20,23,...7,13,19,25,31,37,43,49,...这三组数具有共同的特点.现在有上述特点的一组数,第一个数是3,第三个数是11,则第n个数为( )(A)8n-1 (B)n²+2 (C)4n-1 (D)2n](/uploads/image/z/2664888-24-8.jpg?t=%E8%A7%82%E5%AF%9F%E4%B8%8B%E9%9D%A2%E5%87%A0%E7%BB%84%E6%95%B0%3A1%2C3%2C5%2C7%2C9%2C11%2C13%2C15%2C...2%2C5%2C8%2C11%2C14%2C17%2C20%2C23%2C...7%2C13%2C19%2C25%2C31%2C37%2C43%2C49%2C...%E8%BF%99%E4%B8%89%E7%BB%84%E6%95%B0%E5%85%B7%E6%9C%89%E5%85%B1%E5%90%8C%E7%9A%84%E7%89%B9%E7%82%B9.%E7%8E%B0%E5%9C%A8%E6%9C%89%E4%B8%8A%E8%BF%B0%E7%89%B9%E7%82%B9%E7%9A%84%E4%B8%80%E7%BB%84%E6%95%B0%2C%E7%AC%AC%E4%B8%80%E4%B8%AA%E6%95%B0%E6%98%AF3%2C%E7%AC%AC%E4%B8%89%E4%B8%AA%E6%95%B0%E6%98%AF11%2C%E5%88%99%E7%AC%ACn%E4%B8%AA%E6%95%B0%E4%B8%BA%28+%29%28A%298n-1+%28B%29n%26sup2%3B%2B2+%28C%294n-1+%28D%292n)
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