3,6,( ),24。A.9B.12C.15D.18
3,6,( ),24。
A.9
B.12
C.15
D.18
B.12
C.15
D.18
参考解析
解析:此数列为等比数列,可知公比应为2,则空缺项应为12,B项符合。
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