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Logic - Validity of Arguments

Hi Shrikant, I wonder if your can help me with this:

1) Determine whether the argument is valid or invalid.

A tree as green leaves or the tree does not produce oxygen.
This tree has green leaves.
Therefore:. This tree does not produce oxygen.

2) Use Euler Diagrams to determine whether the following syllogism is valid or invalid.

Some senators are conservationists
No conservationists are pro-development
Therefore: some senators are not pro-development.

4) Determine the truth value of the following statement:

Rembrandt was a famous painter and some odd numbers are prime.

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