UGCPQ Q.22

0. If proposition 'All pens are not pencils' is taken to be true, then which of the following propositions can be false?

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Option : A
Explanation : The proposition 'all pens are not pencils' is equivalent to 'some pencils are pens' or 'some pens are pencils' or 'no pen is pencil'. But 'all pens are not pencils' is negative proposition to 'all pens are pencils'. Hence this is false.

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