Answers

2015-06-28T21:32:26+05:30
Any positive integer can be represented as 
4q+a
  where q is a integer
              a can be 0,1,2,3
if a=0
    then number is 4q 
          so it is divisible by 2
                    So it is an even number
 if a=2
         then number is 
 4q+2=2(2q+1)
              so it is divisible by 2
                    So it is an even number
    Hence proved

0