you can count to infinity 1,2,3,4,5,6,7,8,9.............
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If you count from 1 to 1000000 you count 1000000 numbers so there are 1000000 numbers in 1000000
Go through each of the numbers, and count how many of them are odd. If you count an odd number of them, then their sum is odd. If you count an even number of them, then their sum is even.
50 of them if you count 300.
Just one. unless you count 123456 different from 132456 then there are 46656 * * * * * But you cannot count 123456 as different from 132456 since it is NOT a different combination. And the question was about combinations.