How many unique licence plates are possible under system

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Reference no: EM132410315

A company wishes to assign its employees a unique ' licence plate' for intranet login purposes. Each licence plate has 3 english letters, followed by 3 single digit numbers. none of the letters or numbers are allowed to be repeated, or appear more than once, in each licence plate.

  1. How many unique licence plates are possible under this system?
  2. If numbers are allowed to be repeated and appear more than once, then how many unique licence plates are possible?

Reference no: EM132410315

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