The number of students in a class is a perfect square between $70$ and $90$. The class strength is

The number of students in a class is a perfect square between $70$ and $90$. The class strength is
  1. $81$
  2. $64$
  3. $100$
  4. $49$

Solution

$9^{2} = 81$ is the perfect square in this range.

Asked in: NSO

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