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What is the difference between moldm^3 and moldm^-3 watch

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    I've been given some homework about mole calculations and somas me to give the concentration in moldm^3 while others in moledm^-3.
    I don't however fully understand the difference between them and whether there is different calculations required for them
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    Unit for concentration is mol/dm^3 or moldm^-3
 
 
 
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