afowlkes7132 afowlkes7132
  • 20-09-2019
  • Mathematics
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Proof by contradiction!
Prove that the following statement is true: the sum of two odd numbers is an even number

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steffaniasierrag
steffaniasierrag steffaniasierrag
  • 24-09-2019

Answer:

Let a and b odd numbers and suppose that a+b=2r is even for some integer r.

Since a and b are odd numbers, exist t,w integers such that a=2t+1 and b=2w+1.

Then

a+b=(2t+1)+(2w+1)=2t+2w+2=2(t+w+1). Then a+b is of the form 2*k where k=t+w+1, and this show that a+b is a even number. But this contradicts the hypothesis that a+b is odd.

Note: It is not necessary to prove by contradiction. With a direct prove is enough.

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