What is the number of four-digit decimal numbers ( < 1) in which no...

What is the number of four-digit decimal numbers

( < 1)

in which no digit is repeated?

Options

B. 4536

Let the given 4 digit decimal number is *

\square\square\square\square

Places after decimal can be filled in the following ways:

<table class="qx-match-list qx-match-table" border="1" cellpadding="6" cellspacing="0"><tr><td>7</td><td>8</td><td>9</td><td>9</td></tr></table>

Total number of ways

=7 \times 8 \times 9 \times 9=4536