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==Equations==
abe yeh bahut vella topic HAI ISKO MAT PADHNA KABHI MAT PADHNA The mathematical approach exists in two variations, and is typically formulated as follows:
A store has, at time <math>k</math>, <math>x_k</math> items in stock. It then orders kutte ke bachchon kamino mar jao(and receives) <math>u_k</math> items, and sells <math>w_k</math> items, where <math>w</math> follows a given probability distribution. Thus
: <math> x_{k+1} = x_k + u_k - w_k</math>.
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