Answer :
20-400
21-441
22-484
23-539
24-576
25-625
26-676
27-729
28-784
29-841
300-900
21-441
22-484
23-539
24-576
25-625
26-676
27-729
28-784
29-841
300-900
[tex]20^2 =400 \\
21^2 = 441 \\
22^2=484 \\
23^2 = 539 \\
24^2 = 576 \\
25^2 = 625 \\
26^2 = 676 \\
27^2 = 729 \\
28^2 = 784 \\
29^2 = 841 \\
30^2 = 900 \\[/tex]