13. Proof each directly: a). The sum of any two even integer is even. b) The square of an even integer is even c) The sq
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13. Proof each directly: a). The sum of any two even integer is even. b) The square of an even integer is even c) The square of an odd integer is odd d) The square of every integer of the form 4k+1 is also of the same form where k is an arbitrary integer.
13. Proof each directly: a). The sum of any two even integer is even. b) The square of an even integer is even c) The square of an odd integer is odd d) The square of every integer of the form 4k+1 is also of the same form where k is an arbitrary integer.