Answer:
1,000,000 codes
500,000 even
Step-by-step explanation:
1.
There are 10 different options, 0 - 9, for every digit in the 6-digit sequence;
Since numbers can be repeated, it is very simple;
Imagine a tree diagram, there will 10 branches, since there are 10 options for any given digit, and there will 6 layers, since there are 6 digits in thr sequence;
Hence, the number of possible codes will be:
(10)⁶ = 1,000,000
The way this particular scenario works out is, every number between 0 and 999,999 is a possibility;
There are 1,000,000 numbers between 0 and 999,999 and hence this many possibilities;
This is another way of finding the number of codes.
2.
Consider 0 to 9, 0, 2, 4, 6 and 8 are even, and all others are odd;
There are 5 even in total and 5 odd;
Similarly between 0 and 99, 50 will be even and 50 will be odd;
Therefore between 0 and 999,999, 500,000 will be even and 500,000 will be odd;
Its ½ and ½.
