作业帮一道英文数学题A game of chance consists of rolling a disc of diamet
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一道英文数学题
A game of chance consists of rolling a disc of diameter 2cm on a horizontal square board.The board is divided into 25 small square board of side 4cm.A player wins a prize of,when a disc settles,it lies entirely within the center small square.There is a ridge round the outside edge of the board,so that the disc always bounce back,cannot fall off and lies entirely within the boundary of the large square.What is the probability of winning the prize?
A.1/81 B.1/25 C.8/81 D.1/5
请给出适当的解答过程或说明
A game of chance consists of rolling a disc of diameter 2cm on a horizontal square board.The board is divided into 25 small square board of side 4cm.A player wins a prize of,when a disc settles,it lies entirely within the center small square.There is a ridge round the outside edge of the board,so that the disc always bounce back,cannot fall off and lies entirely within the boundary of the large square.What is the probability of winning the prize?
A.1/81 B.1/25 C.8/81 D.1/5
请给出适当的解答过程或说明
就是在一个平板上滚一个直径2厘米的盘子,平板分成25格,每格边长4厘米.盘子停下来时落在最中间的一格上算赢.平板的边上隆起,所以盘子不会掉下去,而是会反弹回来.问赢的概率.根据概率论好像就是1/25了.
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