Question
How many $7-$digit numbers are there in all$?$
✓
Answer
The largest $7-$digit number $= 9999999$
The smallest $7-$digit number $= 1000000$
$\therefore$ Total number of $7-$digit numbers
$= (9999999 - 1000000) + 1 = 8999999 + 1 = 9000000 =$ Ninety lakhs
The smallest $7-$digit number $= 1000000$
$\therefore$ Total number of $7-$digit numbers
$= (9999999 - 1000000) + 1 = 8999999 + 1 = 9000000 =$ Ninety lakhs
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