state if the following numbers form in triangle pattern , square pattern or rectangular pattern 16,15,18
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The first triangle has just one dot.
The second triangle has another row with 2 extra dots, making 1 + 2 = 3
The third triangle has another row with 3 extra dots, making 1 + 2 + 3 = 6
The fourth has 1 + 2 + 3 + 4 = 10
etc!
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