I intend to post this for a Borel-Cantelli lemma exercise on Math.SE.
The target event is ${\exists i_0 \in \Bbb{N} : \forall i \ge i_0, X_i = 1}$, whose complement is
$$ {\forall i_0 \in \Bbb{N} : \exists i \ge i_0, X_i > = 0} = \limsup_i {X_i = 0}. $$
To apply Borel-Cantelli, one has to determine whether $\sum_i P(X_i = 0)<+\infty$.
Test multiline table in PR/MR body.
Can you speak English? Equation like $1 + 1 = 3 - 1$ or
$$f + g = h?$$