Question

21. How many three digit numbers are there from 1 to 200 which do not have 0 in them?
1).180
2).181
3).790
4).72 friends please answer fast ...pls pls .....don't spam guys pls give answer fast​

Answer 1

Answer:

Assuming leading zeros are not allowed, the first digit of a 3-digit decimal number must be one of the nine digits [123456789]. For each of these nine leading digits, there are 100 possibilities for the next two digits: from 00 thru 99, so there are 900 possible three-digit numbers.