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  The number 1, 3, 6, 10, 15, 21 can be shown as a triangle:















               Dots in the rows starting from the bottom row should be like 6, 5, 4, 3, 2, 1.

               The top row should always have 1 dot.

               So the sequence formed here is in the pattern:

               1, 1 + 2, 1 + 2 + 3, 1 + 2 + 3 + 4,  and so on.


























































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