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1966 AMC 12 Question 20

AMC12 · 1966 AMC 12

Question 20

If the proposition “$a=0$” is true, the negation of the proposition “For real values of $a$ and $b,$ if $a=0,$ then $ab=0$” is:
  1. If $a\ne0,$ then $ab\ne0$
  2. If $a\ne0,$ then $ab=0$
  3. If $a=0,$ then $ab\ne0$
  4. If $ab\ne0,$ then $a\ne0$
  5. If $ab=0,$ then $a\ne0$