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How many 6 digits numbers are there in all
To do: Find how many 6 digit numbers are there
Solution:
The least six-digit number = $100,000$
The greatest 6-digit number = $999,999$
We can consider it as an arithmetic progression , first term : $a= 100,000$
Last term = $999,999$
Common difference : $d = 1$
Formula for nth term = $a+ (n-1)d$
$999,999 = a+ (n-1)d$
$999,999 = 100,000 + (n-1)$
$n = 900,000 $
So, there are 9,00,000 six digit numbers.
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