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13. A counterexample

A. shows that a conjecture is not always true

B. shows that a conjecture is always true

C. is a proof that is not valid

D. cannot be used to prove or disprove a conjecture

Answer :

EVANSISAIAH32IN

Answer:

b

Step-by-step explanation:

Answer:

. shows that a conjecture is not always true

Step-by-step explanation:

How?

  • If you want to prove something you give an example or proof.
  • But if you want to disprove that you need an counterexample.

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