单选题2,3,5,9,( ),33。A15B17C18D19
单选题
2,3,5,9,( ),33。
A
15
B
17
C
18
D
19
参考解析
解析:
3-2=1,5-3=2,9-5=4,17-9=8,33-17=16,1、2、4、8、16构成公比为2的等比数列。即所填数字为9+4×2=17。
3-2=1,5-3=2,9-5=4,17-9=8,33-17=16,1、2、4、8、16构成公比为2的等比数列。即所填数字为9+4×2=17。
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