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In a class of $80$ students, $40$ are girls and $40$ are boys. Also, exactly $50$ students wear glasses. Then the set of all possible numbers of boys without glasses is

  1. $\{0, \dots , 30\}$
  2. $\{10, \dots , 30\}$
  3. $\{0, \dots , 40\}$
  4. none of these
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Let’s suppose all girls wear glasses.Then number of boys who wears glasses are 10. and all boys can wear glasses. so range is 10 to 40.

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