To prove "" All prime numbers are not odd." we showed that " $2$ is even and prime"
This method is

The Direct method.

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The proof by contradiction.

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Induction method.

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The proof by giving counter example.

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Solution

The correct option is A The proof by giving counter example.
counterexample is a special kind of example that disproves a statement or proposition.hence it disproves that all prime numbers are odd hence it is proof by counter example
$D$

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To prove "" All prime numbers are not odd." we showed that "2 is even and prime"This method is

The correct option is A The proof by giving counter example.counterexample is a special kind of example that disproves a statement or proposition.hence it disproves that all prime numbers are odd hence it is proof by counter exampleD

To prove "" All prime numbers are not odd." we showed that " $2$ is even and prime"
This method is

The correct option is A The proof by giving counter example.
counterexample is a special kind of example that disproves a statement or proposition.hence it disproves that all prime numbers are odd hence it is proof by counter example
$D$