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What is the 9th number in this pattern 6 10 15 21 28?

Updated: 8/20/2019
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12y ago

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yn = 1/2n2 + 2 1/2n + 3

y9 = 1/2(9)2 + 2 1/2(9) + 3

y9 = 40 1/2 + 22 1/2 + 3

y9 = 66

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12y ago
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Q: What is the 9th number in this pattern 6 10 15 21 28?
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