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valid proof

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An Invalid Argument 1999-05-31
From Rod Redding:
Can an invalid argument have a true conclusion? If yes then why?
Answered by Walter Whiteley.
A 1999-05-02
From Leah:
a=b
a^2=ab
a^2+b^2=ab-b^2
(a-b)(a+b)=b(a-b)
a+b=b
b
2=1

why is this proof wrong?
Answered by Penny Nom.

 
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