# Contents
## time value of money
some stuff about geometric annuities, macD, and why discount rates are so weird.
### annuity pv
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\[a_{\angln i} = \frac{1-v^n}{i} \]
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### perpetuity
pmf of binomial
\[a_{\angln \infty} = \frac{1}{i} \]
## continuously compounding interest
\[e^{n\delta} = (1+i)^n \]
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