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Mathematics

If universal set = N, the set of natural numbers, set A = {multiples of 3 less than or equal to 20}
and
Set B = {multiples of 4 less then or equal to 20}, then A - B is equal to :

  1. {3, 6, 9, 15, 18}

  2. {4, 8, 16, 20}

  3. {0}

  4. {12}

Sets

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Answer

Universal set = N, the set of natural numbers,

= {1, 2, 3, 4, …………….}

Set A = {multiples of 3 less than or equal to 20}

= {3, 6, 9, 12, 15, 18}

Set B = {multiples of 4 less then or equal to 20}

= {4, 8, 12, 16}

A - B - all the elements of A except the common elements of A and B

= {3, 6, 9, 15, 18}

Hence, option 1 is the correct option.

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