[機統] 兩題機統

[irpolo1 (書會飛)]

https://i.imgur.com/AaaUxm9.jpg
想問第8跟11
感謝
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→ phonya      : 8. p(x>=2)=1-p(x=0)-p(x=1)
→ phonya      : =1-C(5,5)/C(15,5)-C(5,4)*C(10,1)/C(15,5)
→ phonya      : 剩下按計算機
→ phonya      : 11. https://bit.ly/3gKRC4f
推 alchemistry : https://imgur.com/CzTONlY.jpg
→ alchemistry : https://imgur.com/CzTONlY