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Question

If A={1,8,27} and B={x:x=n3,nN,n<4},then A and B are ___ sets.


  1. equal

  2. disjoint

  3. infinite

  4. singleton


Solution

The correct option is A

equal


Given,

A={1,8,27}B={x:x=n3,nN,n<4}.

The values of n are 1, 2 and 3.
Thus, the elements of B are 13,23 and 33.
B={1,8,27}

As the sets A and B have the same elements, they are equal sets.

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