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1+1+2+2+3+3+4+4+5+5+6+6+7+7+8+8+9+9=? ?=x*x

Guest Apr 20, 2017
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 #1
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It looks like ? = 2 * 9 triangulated

x triangulated = (x2 + x)/2

? = 92+9

? = 90

? = x2

90 = x2

\(x =3\sqrt{10}\)

helperid1839321  Apr 21, 2017

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