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?
Algebra.Com
Question 901896: How many sets of 4-letter call letters are possible if:
The last two letters can be repeated?
The last two cannot be repeated?
Answer by Fombitz(32388) (Show Source): You can put this solution on YOUR website!
Assuming the first two letters can be repeated.
Last two repeated :
Last two not repeated : .
.
.
.
Assuming the first two letters cannot be repeated.
Last two repeated :
Last two not repeated :
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