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Let $X\in \{0,1\}$ and $Y\in \{0,1\}$ be two independent binary random variables. If $P(X=0)=p$ and $P(Y=0)=q,$ then $P(X+Y\geq 1)$ is equal to

  1. $pq+(1-p)(1-q)$
  2. $pq$
  3. $p(1-q)$
  4. $1-pq$
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