67,54,46,35,29() A.13 B.15 C.18 D.20

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67,54,46,35,29()A.13B.15C.18D.2067,54,46,35,29()A.13B.15C.18D.2067,54,46,35,29()A.13B.15C.18D.20c.18

67,54,46,35,29() A.13 B.15 C.18 D.20
67,54,46,35,29() A.13 B.15 C.18 D.20

67,54,46,35,29() A.13 B.15 C.18 D.20
c.18
十位是6,5,4,3,2,1
个位与十位的差值两两相同:7-6=1,5-4=1;6-4=2,5-3=2;9-2=7,8-1=7