An even number can be divided by 2 evenly. An odd number will have a remainder of 1 when divided by 2. 13 is an odd number.
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Even plus even equals even. Odd plus odd equals odd. Odd plus even equals odd. 13 + 45 (odd plus odd) will be even. Even plus 24 will be even. Even plus 17will be odd. 13 + 45 + 24 + 17 will be odd.
odd
13 is an odd number and also a prime number
To add to 13 with 2 even and 1 odd number, can do 1+4+8=13
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