Consider universe positive integer X={1≤n≤8} Proposition P= “n is an even…

2023

Consider universe positive integer X={1≤n≤8} Proposition P= “n is an even integer” Q= “(3 ≤ n ≤ 7) (n ≠ 6)”

then truth set of P↔Q is

  1. A.

    → {1,4}

  2. B.

    → {2,6}

  3. C.

    → {3,4,5}

  4. D.

    → {1}

Attempted by 48 students.

Show answer & explanation

Correct answer: A

Universe:

X={1,2,3,4,5,6,7,8}

Given: P: “n is even” ={2,4,6,8}

Q= “(3 ≤ n ≤ 7) (n ≠ 6)

Numbers from 3 to 7 → {3,4,5,6,7}

Remove 6 →

Q={3,4,5,7}

Biconditional

P↔QP

True when both have same truth value (i.e., both true OR both false)

n

P (even)

Q

P↔Q

1

F

F

T

2

T

F

F

3

F

T

F

4

T

T

T

5

F

T

F

6

T

F

F

7

F

T

F

8

T

F

F

{1,4}

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