find the 4th traiangular number
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The answer is in the picture mate
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Triangular Number Sequence
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
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