=n^2 +n =n(n+1) since either n or n+1 has to be even (consecutive numbers) the answer always is an even number
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The sum of an odd and even number is always odd because there's always one left over. Think of any odd number as being any even number plus one. If you add two even numbers, the answer is always even. If you add an even and an odd (plus one), the answer is always odd.
Yes.
Yes, an even number plus an even number is always even. Also, and odd number plus an odd number is always even.
always even
When the sum of a number plus 3 is squared, it is 11 more than the sum of the number plus 2 when squared.
An odd number plus an even number will always be an odd number.
No. it's not a prime number when x = 40, 41, 81,82 ...
The sum of an odd and even number is always odd because there's always one left over. Think of any odd number as being any even number plus one. If you add two even numbers, the answer is always even. If you add an even and an odd (plus one), the answer is always odd.
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