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Worked Examples · Example 5

Q.Find the component statements of the following and check whether they are true or not.

(i) A square is a quadrilateral and its four sides equal.
(ii) All prime numbers are either even or odd.
(iii) A person who has taken Mathematics or Computer Science can go for MCA.
(iv) Chandigarh is the capital of Haryana and UP.
(v) 2\sqrt{2} is a rational number or an irrational number.
(vi) 24 is a multiple of 2, 4 and 8.
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Recall: for "and" (p∧qp \wedge q) the compound is true only when both components are true; for "or" (p∨qp \vee q) the compound is true when at least one component is true.

  1. p: A square is a quadrilateral (True). q: Its four sides are equal (True). Connective: and. T∧T=T \wedge T = True.
  2. p: All prime numbers are even (False — e.g., 3 is prime and odd). q: All prime numbers are odd (False — e.g., 2 is prime and even). Connective: or. F∨F=F \vee F = False.
  3. p: A person who has taken Mathematics can go for MCA (True, by the eligibility rule assumed). q: A person who has taken Computer Science can go for MCA (True). Connective: or. T∨T=T \vee T = True. …

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