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Question

If A and B are two equal sets, then which of the following is not true?

A
AB
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B
BA
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C
AB
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D
BA
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Solution

The correct option is C AB
AB is true because equal sets are subsets of each other.

BA is also true because equal sets are subsets of each other.

Let set A={a,b,c} and set B={a,b,c} [A and B are equal sets]
aB, bB, cB
But {a,b,c}B
AB
It means A is a subset of B, but A is not an element of B.
So, AB is not true.

Let set A={a,b,c} and set B={a,b,c} [A and B are equal sets]
aA, bA, cA
But {a,b,c}A
BA which is true.

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