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Is 9 a triangle number

Updated: 9/21/2023
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Wiki User

12y ago

Best Answer

no, these are the first 20 triangle numbers:

1 3 6 10 15 21 28 36 45 55

66 78 91 105 120 136 153 171 190 210

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Wiki User

12y ago
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Q: Is 9 a triangle number
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