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2 x 3 = 6

3 x 4 = 12

4 x 5 = 20

5 x 6 = 30

6 x 7 = 42

7 x 8 = 56

8 x 9 = 72

9 x 10 = 90

10 x 11 = 110

since rectangular numbers are of the form n(n+1) for natural numbers n > 1 That is because these form rectangles.

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Q: List 9 first rectangular numbers
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