#### Answer

12600

#### Work Step by Step

Since it is vertical, order definitely matters.
Thus, this is equivalent to making words with letters.
We put repetitions on the bottom and totals on top.
$\frac{10!}{4!*3!*2!*1!}=10*9*8*7*5/2=12600$

Published by
Pearson

ISBN 10:
0321979478

ISBN 13:
978-0-32197-947-6

12600

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