The First Order Logic (FOL) statement (R∨Q)∧(P∨¬Q) is equivalent to which of…

2021

The First Order Logic (FOL) statement (R∨Q)∧(P∨¬Q) is equivalent to which of the following?

Answer: B. ((R∨Q)∧(P∨¬Q)∧(R∨P))Given: (R ∨ Q) ∧ (P ∨ ¬Q) Using Boolean algebra: (R + Q)(P + Q̅) Expanding, = RP + RQ̅ + PQ + QQ̅ Since, QQ̅ = 0 therefore, = RP + RQ̅ + PQ Now check Option…

  1. A.

    (R∨Q)∧(P∨¬Q)∧(¬R∨P)

  2. B.

    ((R∨Q)∧(P∨¬Q)∧(R∨P))

  3. C.

    (R∨Q)∧(P∨¬Q)∧(¬R∨¬P)

  4. D.

    (R∨Q)∧(P∨¬Q)∧(¬R∨P)

Attempted by 34 students.

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Correct answer: B

Given:

(R ∨ Q) ∧ (P ∨ ¬Q)

Using Boolean algebra:

(R + Q)(P + Q̅)

Expanding,

= RP + RQ̅ + PQ + QQ̅

Since,

QQ̅ = 0

therefore,

= RP + RQ̅ + PQ

Now check Option B:

(R + Q)(P + Q̅)(R + P)

First compute:

(R + Q)(P + Q̅)

= RP + RQ̅ + PQ

Now multiply by (R + P):

(RP + RQ̅ + PQ)(R + P)

Using absorption laws:

RP(R + P) = RP

RQ̅(R + P) = RQ̅

PQ(R + P) = PQ

Hence,

= RP + RQ̅ + PQ

which is exactly the original expression.

Therefore,

(R ∨ Q) ∧ (P ∨ ¬Q)

≡ (R ∨ Q) ∧ (P ∨ ¬Q) ∧ (R ∨ P)

Correct Option: B

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