Choose the model

Question

Accepted Answer

0

Answer

-1

Answer

1

Answer

<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:m="http://schemas.openxmlformats.org/officeDocument/2006/math"><mml:mo>+</mml:mo><mml:mi> </mml:mi><mml:mi>∞</mml:mi><mml:mi> </mml:mi></mml:math>