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<title id="MathJax-SVG-1-Title">upper T Subscript n Baseline equals sigma-summation Underscript i equals 1 Overscript n Endscripts i equals 1 plus 2 plus 3 plus ellipsis plus n equals StartFraction n left-parenthesis n plus 1 right-parenthesis Over 2 EndFraction equals StartBinomialOrMatrix n plus 1 Choose 2 EndBinomialOrMatrix</title>
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