古泰拳套路插画:英语智力题

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Determine the next number in 77, 49, 36, 18, ____ and provide an explanation of your answer.
请给出思考方法,谢

8
7*7=49
4*9=36
3*6=18
1*8=8

7*7=49
4*9=36
3*6=18
1*8=8

it's 8, easy

8

8