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If I remember correctly, the triangle numbers are 1, 3, 6, 10, 15... It is like racking up billiard balls or Bowling pins. If the first number is 1, then the 3rd number is 6.

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14y ago

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6

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Wiki User

9y ago
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6 is the 3rd triangle number

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Anonymous

4y ago
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Q: What is the third triangular number?
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