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Three European put options on the same stock With the same time to maturity are trading at p1 = $20, p2 = $1.7, and p3 = $1.0. The corresponding exercise prices are K1 = 20, K2 = 16, K3 = 10. Is there an arbitrage opportunity? How to take advantage of it? Two European put options written on the same stock with the same time to maturity of one year are trading at p1 = $5.5, p2 = $0.7. The corresponding exercise prices are K1 = $30 and K2 = $25. The riskfree interest rate is 10% per annual. Is there an arbitrage opportunity? How to take advantage of it