buffaloboy wrote:
I think this is a poor-quality question. Pl mention that digit plates contain single digit each.
Hi,
The Q is correct as it is, and I would say "a good Question'
what you are referring to is not single digit but a number, as a number can have 2,3 etc digits....
if we do not talk of the base, we are working on, it is supposed to be decimal system..
Decimal system has 10 digits, 0 to 9..
Binary system has two digits, 0 and 1..
and so on..
so the moment we say digits plate, it means single digit plate..
the houses can have 1,2,3,.. digit numbers..
since it is consecutive and starts from 1..
single digit platyes required are 9, 1 to 9..
2 digit numbers, thereafter, are 2*90, 10 to 99...
now lets see how many plates are left..
1212-9-180=1023..
if these are 3 digit numbers, number of digit plates required=1023/3=341..
total number of houses=
9+180+341=440, which is a three digit number and so OK..