$\begin{array}{1 1}(A)\;738\\(B)\;792\\(C)\;837\\(D)\;720\end{array} $

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- $P(n,r)=\large\frac{n!}{(n-r)!}$

Total number of 1 digit number =9

The number of 2 digit non-repeated number =$9\times 9$

$\Rightarrow 81$

The number of 3 digit non-repeated number =$9\times 9P_2$

$\Rightarrow 9\times 9\times 8$

$\Rightarrow 648$

$\therefore$ Required number of ways =9+81+648

$\Rightarrow 738$

Hence (A) is the correct answer.

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