A combination lock uses three digits from 0-9. If the product of the digits are even, how many lock combos are possible?
If the product is even, then at least one of the digits must be even.
There are possible combinations. WHY?
There are possible combinations having only odd digits. WHY?
So what is the answer?
If the product is even, then at least one of the digits must be even.
There are possible combinations. WHY?
There are possible combinations having only odd digits. WHY?
So what is the answer?