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Which of the Six Rules for determining the validity of categorical syllogism does the following categorical syllogism violate?:

Some nebulas are clouds of gas.

Some clouds of gas are objects invisible to the naked eye.

Therefore, some objects invisible to the naked eye are nebulas.

one premise is negative,

the conclusion must be negative; and if the conclusion is negative, then one

premise must be negative.

67%

The

middle term must be distributed

at least once.

33%

a term is distributed

in the conclusion, the it must be distributed in the premise.

syllogism can have two negative

premises.

syllogism must have only three terms

(not three words, but terms).

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