ag-gipp/GoUldI

<math xmlns='http://www.w3.org/1998/Math/MathML' display='inline'><semantics><mrow><mn>1</mn><mo>+</mo><mi>x</mi><mo>+</mo><msup><mi>x</mi> <mn>2</mn></msup><mo>+</mo><mi>…</mi><mo>+</mo><msup><mi>x</mi> <mrow><mi>n</mi><mo>−</mo><mn>1</mn></mrow></msup><mo>+</mo><msup><mi>x</mi> <mi>n</mi></msup><mo>=</mo><mfrac><mrow><msup><mi>x</mi> <mrow><mi>n</mi><mo>+</mo><mn>1</mn></mrow></msup><mo>−</mo><mn>1</mn></mrow><mrow><mi>x</mi><mo>−</mo><mn>1</mn></mrow></mfrac><mtext> </mtext><mtext>assuming</mtext><mtext> </mtext><mi>x</mi><mo>≠</mo><mn>1</mn></mrow><annotation encoding='application/x-tex'>1+x+x^{2}+\ldots+x^{n-1}+x^{n}=\frac{x^{n+1}-1}{x-1} \ \text{assuming} \ x \neq 1</annotation></semantics></math>