The sum of any four odd numbers will never be equal to an odd number.
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This is not possible, 27 is an odd number, 4 odd numbers will always equal an even number.
2 odd numbers added together equal an event number. to even numbers added together equal an even number. it is impossible to make 4 odd numbers equal an even.
3721
The sum of the first x odd numbers is equal to x2 (for integers only.) For example, take 72: We'll take the first seven odd numbers: 1 + 3 + 5 + 7 + 9 + 11 + 13 = 4 + 12 + 20 + 13 = 16 + 33 = 49 This then, can be expressed as follows:     x x2 = Σ(2n - 1)    n=1
If the sum of two numbers is even, the two numbers are either both even or both odd. A few examples:2 + 4 = 6 (even + even = even)2 + 3 = 5 (even + odd = odd)5 + 2 = 7 (odd + even = odd)7+13 = 20 (odd + odd = even)