Suppose the terminal payoff of an exchange rate option is F T 1 {F T >X}. Let

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Suppose the terminal payoff of an exchange rate option is FT1{FT >X}. Let Vd (F, t) denote the value of the option in domestic currency, show that

V(F, t) = e(T) FEQ [1{F7>X}\Ft = F] = e FN (d) = erat et FN(d),  where 8=ra - rf and d In 1/2 + (ra  rf + //

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