SOLUTION: How many sets of 4-letter call letters are possible if:
The last two letters can be repeated?
The last two cannot be repeated?
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-> SOLUTION: How many sets of 4-letter call letters are possible if:
The last two letters can be repeated?
The last two cannot be repeated?
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You can put this solution on YOUR website! Assuming the first two letters can be repeated.
Last two repeated :
Last two not repeated : .
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Assuming the first two letters cannot be repeated.
Last two repeated :
Last two not repeated :
