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Question Number 70638 by abdusalamyussif@gmail.com last updated on 06/Oct/19

Commented by MJS last updated on 06/Oct/19

$$\mathrm{the}\mathrm{first}\mathrm{question}\mathrm{cannot}\mathrm{be}\mathrm{complete}$$

Answered by mr W last updated on 06/Oct/19

$$Q1:$$$$i{don}^{\prime }tunderstandthequestion.$$$$$$$$Q2:$$$$one-digitnumbers:X$$$$\Rightarrow 9numbers$$$$two-digitnumbers:XY$$$$\Rightarrow 9\times 9=81$$$$three-digitnumbers:XYZ$$$$\Rightarrow 9\times 9\times 8=648$$$$$$$$totally:9+81+648=738numbers$$

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