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Hello everyone!

It's been a loooong time (almost 2 years) since I haven't touched Brilliant.org (and I don't know if you guys remember me anyway -_- ...

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Final results: Aloysius Ng won!

Summary of rounds:

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If the price of a stock doubles from $50 to $100 in one day, how would the price of the $100 call option today, compare with the $50 call option ...

How would you value an ATM call on an asset with spot price $100 and trading-day volatility of 1.5%, with 50 trading-days to expiry?

What assumptions are you making?

For what values of $n$ does there exist complex $n \times n$ matrices $A, B$ such that

$A B - BA = Id?$

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