If there are $n$ independent trials,$p$ and $q$ are the probability of success and failure respectively,then what is the probability of exactly $r$ successes?
- A$^nC_{n+r} p^r q^{n-r}$
- B$^nC_r p^{r-1} q^{r+1}$
- C$^nC_r p^r q^{n-r}$
- D$^nC_r p^{r+1} q^{r-1}$
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