The probabilities that $A$ and $B$ will die within a year are $p$ and $q$ respectively, then the probability that only one of them will be alive at the end of the year is
The probabilities that $A$ and $B$ will die within a year are $p$ and $q$ respectively, then the probability that only one of them will be alive at the end of the year is
- A
$p + q$
- B
$p + q - 2qp$
- C
$p + q - pq$
- D
$p + q + pq$
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