greek letters in markdown

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**Fractions** in **inline** math mode: $\frac{a}{b}$ and in **display** math mode: $\frac{a}{b}$ Logistic Regression Model: $ P(Y=1) = \frac{e^{\alpha+\beta x}}{1+e^{\alpha+\beta x}} $ Knitted Output: Fractions in inline math mode: a b and in display math mode

Fractions in inline math mode: ab and in display math mode: $$\frac{a}{b}$$ Logistic Regression Model: $$ P(Y=1) = \frac{e^{\alpha+\beta x}}{1+e^{\alpha+\beta x}} $$