Assume the Black-Scholes framework. A European cash-or-nothing spread on a stock pays $1 at time T if

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Assume the Black-Scholes framework. A European cash-or-nothing spread on a stock pays $1 at time T if and only if the stock price at time T lies in the interval [a, b], where a and b are positive numbers with a < b. 

Determine an expression for the price of such a spread using common symbols.

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