2,3,7,25,121,数字推理是几a.256 b.512 C.600 d.721

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2,3,7,25,121,数字推理是几a.256b.512C.600d.7212,3,7,25,121,数字推理是几a.256b.512C.600d.7212,3,7,25,121,数字推理是几a.2

2,3,7,25,121,数字推理是几a.256 b.512 C.600 d.721
2,3,7,25,121,数字推理是几a.256 b.512 C.600 d.721

2,3,7,25,121,数字推理是几a.256 b.512 C.600 d.721
答案是 D 721
3=2*2-1
7=3*3-2
25=7*4-3
121=25*5-4
721=121*6-5
乘数2 3 4 5 6为等差数列
减数1 2 3 4 5为等差数列