Write convincing argument that used inderect reasoning: the product of two numbers is even. Show that at least one of the numbers must be even

Question

anonymous · Answer

i assume indirect reasoning in this case means a proof by contradiction

anonymous · Answer

in which case you would assume that the product is even and both the numbers were odd, and derive the contradiction

anonymous · Answer

clear or no?  
two general odd numbers look like $2k+1$ and $2j+1$ 
multiply them together and deduce that the product is odd

anonymous · Answer

Nice.