Mathematics
Senior High
！！請問這題怎麼求？？
绝知袋中有11顆球,其中紅球x顆,剩餘為白球,自袋中任取2球,令取
到1紅1白的機率為Px,取到2紅的機率為Qx,則Px-Qx的最大值為
(17-1)
為
tre ( 化為最簡分數)E
(17-2)
1
D
7
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