First slide

Introduction to Relations (XI) on Sets

Question

If P = {a,b,c} and Q = {r}, Then

Easy

A

$P \times Q \neq Q \times P$
B

$P \times Q = Q \times P$
C

$n (P \times Q) \neq n (Q \times P)$
D

1 and 3

Solution

$P \times Q = \{(a, r), (b, r), (c, r)\}$
$Q \times P = \{(r, a), (r, b), (r, c)\}$

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