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CAT 2023 Set-1 | Quantitative Aptitude | Question: 20

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$1$ Digit numbers $\Rightarrow 9$

$2$ Digits numbers $\Rightarrow 9*9=81$

$3$ Digits numbers $\Rightarrow 9*9*8=648$

Adding all up we will get , $738$

Hence option $D$ is correct.
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