谢芷蕙不给盥洗哥面子# Joke - 肚皮舞运动
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1 楼
You have 40 cans, all placed in a line at exact intervals of one meter.
You also have 9 apples. You wish to place all the apples in the cans, no
more than one apple in each can, so that there are no three apples A, B,
and C such that the distance between A and B is equal to the distance
between B and C. How many ways can you arrange the apples in the cans?
怎么解?
You also have 9 apples. You wish to place all the apples in the cans, no
more than one apple in each can, so that there are no three apples A, B,
and C such that the distance between A and B is equal to the distance
between B and C. How many ways can you arrange the apples in the cans?
怎么解?