Question: Alpha-numeric number plates have two letters followed by four digits. How many plates are possible if: a there are no restrictions b the first letter

 Alpha-numeric number plates have two letters followed by four digits. How

many plates are possible if: a there are no restrictions b the

Alpha-numeric number plates have two letters followed by four digits. How many plates are possible if: a there are no restrictions b the first letter must be a vowel c no letter or digit may be repeated

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