Question 2

How many 100 digit positive number are there?

Solution

The given number has 100 digits
first digit can be any number other than 0 and so it has 9 values from 1 to 9
All the other 99 digits can be from 0 to 9 i.e 10 values
therefore 9*10*10....99 times
=$$9*10^{99} $$


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