math: fix range formula
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@ -256,7 +256,7 @@ $$
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P(X=r)&=\text{binompdf}(n,p,r) \\
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P(X<r)&=\text{binomcdf}(n,p,r-1) \\
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P(X\leq r)&=\text{binomcdf}(n,p,r) \\
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P(a\leq X\leq b)&=\text{binomcdf}(n,p,b) - \text{binomcdf}(n,p,a)
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P(a\leq X\leq b)&=\text{binomcdf}(n,p,b) - \text{binomcdf}(n,p,a-1)
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\end{align*}
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$$
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