The ratio is 1:2.
For every even number there are 2 odd numbers.
Fibonacci Series:
0, 1, 1, 2, 3, 5, 8, 13, 21, 34, ...
which is
even, odd, odd, even, odd, odd, even, odd, odd, even, ...
the pattern continues
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ratio
if the numbers are from 1 - 9 then the ratio of even to odd is 4:5 (2, 4, 6 & 8 are even, 1, 3, 5, 7 & 9 are odd)
There is no such pattern because there are no even odd numbers. Odd numbers, by definition, are odd and therefore, not even.
The answer depends on how many odd numbers are being added together: even numbers make no difference.If the count of odd numbers is odd then the total is odd, andff the count of odd numbers is even then the total is even.
Multiply two odd numbers Add an even and an odd Subtract an odd and an even