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Question -

Which of the following sets are equal?
A = {x: x ∈ N, x < 3}
B = {1, 2}, C= {3, 1}
D = {x: x ∈ N, x is odd, x < 5}
E = {1, 2, 1, 1}
F = {1, 1, 3}



Answer -

A = {1, 2}
B = {1, 2}
C = {3, 1}
D = {1, 3} (since, the odd natural numbers less than 5 are 1 and 3)
E = {1, 2} (since, repetition is not allowed)
F = {1, 3} (since, repetition is not allowed)
∴ Sets A, B and E are equal.
C, D and F are equal.

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