Question:
List all the elements of each of the sets given below
$D=\left\{x: x=n^{2}, n \in N\right.$ and $\left.2 \leq n \leq 5\right\}$
Solution:
Here, $x=n^{2}$ and $2 \leq n \leq 5$
∴ n = 2, 3, 4, 5
[it is given that n is less than equal to 2 and greater than equal to 5]
If
$n=2, x=(2)^{2}=4$
$n=3, x=(3)^{2}=9$
$n=4, x=(4)^{2}=16$
$n=5, x=(5)^{2}=25$
So, D = {4, 9, 16, 25}