medium · LSAT Logical Reasoning

A rule states: if you are 18, you can vote. A particular person is 21. It is concluded that this person can vote.

Strictly on the basis of the rule as stated, is this inference valid?

  1. Yes, this is a textbook instance of modus ponens applied to the stated age rule.
  2. No, because being 21 fails to match the exact triggering condition the rule specifies.
  3. Yes, because 21 is plainly greater than 18 and so comfortably clears the rule's threshold.
  4. No, because the rule was almost certainly intended to set a minimum voting age rather than an exact one.
  5. No, since no rule keyed to a single fixed age can ever speak to a person's voting eligibility.

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