Determine the energy and number of configurations

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Homework Statement



N surfactant molecules occupy an interface with A binding sites. The molecule has energy= -ε when perpendicular to the interface, and -δ when parallel to the interface (ε>δ>0). M is the number of surfactants perpendicular to the interface.

For a given value of M, determine the energy E(M) and the number of configurations \Gamma(M)

Homework Equations



None that I know of...

The Attempt at a Solution



I don't even know where to begin. Any advice or direction much appreciated.
 
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If M molecules are perpendicular to the interface and have an energy -ε each, how many of the N molecules are parallel and have an energy -δ each? What is the total energy of all molecules together?
In how many ways can you choose M particles out of N?
 

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