2, 1, 4,3,8, 9,( ),27A.12B.14C.16D.18
2, 1, 4,3,8, 9,( ),27
A.12
B.14
C.16
D.18
B.14
C.16
D.18
参考解析
解析:间隔组合数列。
奇数项:2,4,8,(16)组成公比为2的等比数列;
偶数项=1,3,9,27组成公比为3的等比数列。
奇数项:2,4,8,(16)组成公比为2的等比数列;
偶数项=1,3,9,27组成公比为3的等比数列。
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