2,19,39,65,93,() A.155 B.126 C.199 D.172

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2,19,39,65,93,() A.155 B.126 C.199 D.172

2,19,39,65,93,() A.155 B.126 C.199 D.172
2,19,39,65,93,() A.155 B.126 C.199 D.172

2,19,39,65,93,() A.155 B.126 C.199 D.172
B.126
2 19 39 65 93隔一位相减得
37 46 54 继续相减
9 8 下一个是7
所以 37 46 54 61
65+61=126