MCQ
If Y ∪ {1, 2} = {1, 2, 3, 5, 9}, then:
  • A
    The smallest set of Y is {3, 5, 9}
  • B
    The smallest set of Y is {2, 3, 5, 9}
  • C
    The largest set of Y is {1, 2, 3, 5, 9}
  • D
    The largest set of Y is {2, 3, 4, 9}

Answer

  1. The smallest set of Y is {3, 5, 9}
  1. The largest set of Y is {1, 2, 3, 5, 9}

Solution:

Since the set of the right hand side has 5 elements,

$\therefore$ smallest set of Y has three elements and largest set of

Y has five elements,

$\therefore$ smallest set of Y is {3, 5, 9}

and largest set of Y is {1, 2, 3, 4, 9}

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