0, 2,4,6,8 ...... i.e. all positive numbers/natural numbers which are divisible by 2 are called as even integers.
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n + 1
No. For any integer, you can add one to get an even greater integer.
2n + 2 = 2(n+1)
3
An even integer is a multiple of 2 so that if x is the even integer then there is some other integer a such that x = 2a. An odd integer is one which, when you divide it by 2, leaves a remainder of 1. That is, if y is the odd integer, then y = 2b + 1 for some other integer b. Now, the sum of the even and odd integer is x + y = 2a + 2b + 1 = 2(a+b) + 1 By the closure of integers under addition, a and b are integers implies that a+b is an integer. So 2(a+b) is even and so the sum is odd.