First slide

Introduction to sets

Question

If ‘X’ is the set of letters needed to spell “CATARACT” and ‘Y’ is the set of letters needed to spell “TRACT” then

Easy

A

$X \subset Y$
B

$Y \subset X$
C

$X \cap Y = ϕ$
D

X = Y

Solution

X = {C, A, T, R}
Y = {T, R, A, C}
$∴ X = Y$

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