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Even Numbers:
let a1,a2,a3 are even
=>
a1+a2 is even => closure property is satisfied
a1+(a2+a3) = (a1+a2)+a3 => Associative
a1 +0 = a1 => Identity element exists
a1-a1 = 0 => inverse exists
=>
even integers set is a group
ODD Numbers
let a1,a2 be two odd numbers
=>
a1 +a2 is even
=>
NOT closed
=>
Odd integers is not a group
Solution
Even Numbers:
let a1,a2,a3 are even
=>
a1+a2 is even => closure property is satisfied
a1+(a2+a3) = (a1+a2)+a3 => Associative
a1 +0 = a1 => Identity element exists
a1-a1 = 0 => inverse exists
=>
even integers set is a group
ODD Numbers
let a1,a2 be two odd numbers
=>
a1 +a2 is even
=>
NOT closed
=>
Odd integers is not a group

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Even Numberslet a1,a2,a3 are even=a1+a2 is even = closure p.pdf

  • 1. Even Numbers: let a1,a2,a3 are even => a1+a2 is even => closure property is satisfied a1+(a2+a3) = (a1+a2)+a3 => Associative a1 +0 = a1 => Identity element exists a1-a1 = 0 => inverse exists => even integers set is a group ODD Numbers let a1,a2 be two odd numbers => a1 +a2 is even => NOT closed => Odd integers is not a group Solution Even Numbers: let a1,a2,a3 are even => a1+a2 is even => closure property is satisfied a1+(a2+a3) = (a1+a2)+a3 => Associative a1 +0 = a1 => Identity element exists a1-a1 = 0 => inverse exists => even integers set is a group ODD Numbers let a1,a2 be two odd numbers => a1 +a2 is even => NOT closed
  • 2. => Odd integers is not a group