Answer :

20-400
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]

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