#### Answer

$25$

#### Work Step by Step

A,B,C,D and E are 5 distinct objects from which we should make 2-letter codes.
This implies, n=5.
Since repetition is allowed, the number of two letter codes is:
$= n(n)
\\= 5(5)
\\= 25$

Published by
Pearson

ISBN 10:
0-32193-104-1

ISBN 13:
978-0-32193-104-7

$25$

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