Solution
= Solution
<Chebyshev inequality> gives $\mathbb P(T=0)\le\mathbb P(|T-\mathbb ET|\ge\mathbb ET)\le\operatorname{var}(T)/(\mathbb ET)^2\to0$.
= Solution
<Chebyshev inequality> gives $\mathbb P(T=0)\le\mathbb P(|T-\mathbb ET|\ge\mathbb ET)\le\operatorname{var}(T)/(\mathbb ET)^2\to0$.