Answer the following:
Write the smallest and greatest $9 -$ digit number

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Solution

For finding the smallest $9 -$ digit number place $1$ in the ten-crores place and $0$ in the remaining place.
So, the smallest $9 -$ digit number $= 10, 00, 00, 000$
For finding the greatest $9 -$ digit number place $9$ in all nine places.
So, the greatest $9 -$ digit number $= 99, 99, 99, 999$
Hence, the greatest and smallest $9 -$ digit number is $99, 99, 99, 999$ and $10, 00, 00, 000$ .

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