In 1997, Canadian Province of Ontario changed the format of car licence plates from using any...

 

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In 1997, Canadian Province of Ontario changed the format of car licence plates from using any three upper case letters and any three digits (such as ABC-012) to using any four upper case letters and any three digits (such as ABCD-123). How many different licence plates were possible before 1997, and how many different licence plates are possible now? In 1997, Canadian Province of Ontario changed the format of car licence plates from using any three upper case letters and any three digits (such as ABC-012) to using any four upper case letters and any three digits (such as ABCD-123). How many different licence plates were possible before 1997, and how many different licence plates are possible now?