In how many ways can $5$ letters be mailed if there are different mailboxes available if each letter can be mailed in any mailbox.

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Solution

Different number of ways = Arrangement of $5$
$= ∠ 5 = 120$

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In how many ways can 5 letters be mailed if there are different mailboxes available if each letter can be mailed in any mailbox.

Different number of ways = Arrangement of 5=∠5=120

In how many ways can $5$ letters be mailed if there are different mailboxes available if each letter can be mailed in any mailbox.

Different number of ways = Arrangement of $5$
$= ∠ 5 = 120$