怎么证明∑c(k,n)p^k*q^(n-k)=1= =对不起啊,题目问错了...应该是证明介个...∑[c(k,M)*c(n-k,N-M)]/c(n,N)=1
问题描述:
怎么证明∑c(k,n)p^k*q^(n-k)=1
= =对不起啊,题目问错了...应该是证明介个...∑[c(k,M)*c(n-k,N-M)]/c(n,N)=1
答
怎么证明∑c(k,n)p^k*q^(n-k)=1
= =对不起啊,题目问错了...应该是证明介个...∑[c(k,M)*c(n-k,N-M)]/c(n,N)=1