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A stock price follows geometric Brownian motion with an expected return (µ) of 15% and a volatility (σ) of 30%.

The current price is $45. (Tip: make use of the ln(ST) distribution)

(a)   What is the probability that a European call option on the stock with an exercise price of $50 and a maturity date in six months will be exercised?

(b)  What is the probability that a European put option on the stock with the same exercise price and maturity will be exercised?

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