Question

prove that every positive integer is either even or odd​

Answer 1

positive integers = 1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,............

in that numbers

even = 2,4,6,8,10,12,14,16,18,20,.......

odd= 1,3,5,7,9,11,1,1,51,7,1,9,21,..........

hence every positive integer is either even or odd.