  The aim of this paper is to evaluate geometric Asian option by a mixed
fractional subdiffusive Black-Scholes model. We derive a pricing formula for
geometric Asian option when the underlying stock follows a time changed mixed
fractional Brownian motion. We then apply the results to price Asian power
options on the stocks that pay constant dividends when the payoff is a power
function. Finally, lower bound of Asian options and some special cases are
provided.
