[機統] 關於P(X1<X2<X3)
let X1,X2,X3 be independent random variables taking values in the positive
integers and having mass function given by P(Xi=x)=(1-pi)*pi^x-1 for x=1,2,
...,and i=1,2,3 SHOW THAT
P(X1<X2<X3)=(1-p1)(1-p2)p2*p3^2 / (1-p2p3)*(1-p1p2p3)
原題如上
比較不知道P(X1<X2<X3)倒底是甚麼意思
希望有大大能夠提供一下意見
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