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Which numbers can be shown as a line only?
Which numbers can be shown as rectangles?
Which numbers can be shown as squares?
Which numbers can be shown as triangles? eg. 3,6,.....
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7
(1) one 1
(2) 0,2,4,6,8...
(3) 1,4,9,16 etc...
(4) 6,10,15,21...
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