Mathematics
Senior High
Resolved
請問這題該怎麼做？
28
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P,取到2紅的機率為Qx,則Px-Qx的最大值為
(17-1) 18Z
為
(化為最簡分數)
(17-2
/R(x)
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