Define 2nd law of thermodynamics in two ways

Smythe

A question asks,

Define the second law of thermodynamics in two different ways and show these two ways are equivalent.

Could anyone give me any pointers as to what this might mean? I know what the 2nd law of thermodynamics states, but how would I define it in two different ways?

Thank you.

Morbert

http://en.wikipedia.org/wiki/Second_law_of_thermodynamics#Clausius_statement

http://en.wikipedia.org/wiki/Second_law_of_thermodynamics#Kelvin_statement

FISMA

The British scientist and author C.P. Snow had an excellent way of remembering the three laws:

1. You cannot win (that is, you cannot get something for nothing, because matter and energy are conserved).
2. You cannot break even (you cannot return to the same energy state, because there is always an increase in disorder; entropy always increases).
3. You cannot get out of the game (because absolute zero is unattainable).

http://www.physlink.com/education/askexperts/ae280.cfm