opsc.gov.inopsc.gov.in/Attachment/OASpre/Philosophy_2006_ocs_pre.pdf · A syllogism is invalid if...
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opsc.gov.inopsc.gov.in/Attachment/OASpre/Philosophy_2006_ocs_pre.pdf · A syllogism is invalid if (a) It has only three terms (b) It has a middle term (c) It has two negative premises