How many three-digit numbers are there in which the sum of the digits is even?
There are 900 three-digit numbers.
I guess half of them (450) will have even sum of digits. Is this right? I don't know how to prove this, though.
How many three-digit numbers are there in which the sum of the digits is even?
There are 900 three-digit numbers.
I guess half of them (450) will have even sum of digits. Is this right? I don't know how to prove this, though.