2,3,4,9,12,15,22,( )A.27 B.31 C.36 D.42

问题描述:

2,3,4,9,12,15,22,( )A.27 B.31 C.36 D.42

2+3+4=93+4+9=164+9+12=259+12+15=3612+15+22=49?=64-22-15=尾数7A