In the binomial expansion of $(1 + x)^{15}$, the coefficients of $x^r$ and $x^{r+3}$ are equal. Then $r$ is ....... - DASH

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In the binomial expansion of $(1 + x)^{15}$, the coefficients of $x^r$ and $x^{r+3}$ are equal. Then $r$ is .......

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