<math xmlns='http://www.w3.org/1998/Math/MathML' display='block'><semantics><mrow><mstyle displaystyle="true" scriptlevel="0"><mrow><mstyle displaystyle="true" scriptlevel="0"><mrow><mo maxsize="2.047em" minsize="2.047em">(</mo><mfrac linethickness="0"><mstyle displaystyle="true" scriptlevel="0"><mrow><mfrac><mi>a</mi><mi>b</mi></mfrac></mrow></mstyle><mstyle displaystyle="true" scriptlevel="0"><mrow><mfrac><mi>c</mi><mi>d</mi></mfrac></mrow></mstyle></mfrac><mo maxsize="2.047em" minsize="2.047em">)</mo></mrow></mstyle><mstyle displaystyle="false" scriptlevel="0"><mstyle displaystyle="true" scriptlevel="0"><mrow><mo maxsize="2.047em" minsize="2.047em">(</mo><mfrac linethickness="0"><mstyle displaystyle="true" scriptlevel="0"><mrow><mfrac><mi>a</mi><mi>b</mi></mfrac></mrow></mstyle><mstyle displaystyle="true" scriptlevel="0"><mrow><mfrac><mi>c</mi><mi>d</mi></mfrac></mrow></mstyle></mfrac><mo maxsize="2.047em" minsize="2.047em">)</mo></mrow></mstyle><mstyle displaystyle="false" scriptlevel="1"><mstyle displaystyle="true" scriptlevel="0"><mrow><mo maxsize="2.047em" minsize="2.047em">(</mo><mfrac linethickness="0"><mstyle displaystyle="true" scriptlevel="0"><mrow><mfrac><mi>a</mi><mi>b</mi></mfrac></mrow></mstyle><mstyle displaystyle="true" scriptlevel="0"><mrow><mfrac><mi>c</mi><mi>d</mi></mfrac></mrow></mstyle></mfrac><mo maxsize="2.047em" minsize="2.047em">)</mo></mrow></mstyle><mstyle displaystyle="false" scriptlevel="2"><mstyle displaystyle="true" scriptlevel="0"><mrow><mo maxsize="2.047em" minsize="2.047em">(</mo><mfrac linethickness="0"><mstyle displaystyle="true" scriptlevel="0"><mrow><mfrac><mi>a</mi><mi>b</mi></mfrac></mrow></mstyle><mstyle displaystyle="true" scriptlevel="0"><mrow><mfrac><mi>c</mi><mi>d</mi></mfrac></mrow></mstyle></mfrac><mo maxsize="2.047em" minsize="2.047em">)</mo></mrow></mstyle></mstyle></mstyle></mstyle></mrow></mstyle></mrow><annotation encoding='application/x-tex'> \displaystyle \dbinom{\displaystyle{a\over b}}{\displaystyle{c\over d}} \textstyle \dbinom{\displaystyle{a\over b}}{\displaystyle{c\over d}} \scriptstyle \dbinom{\displaystyle{a\over b}}{\displaystyle{c\over d}} \scriptscriptstyle \dbinom{\displaystyle{a\over b}}{\displaystyle{c\over d}} </annotation></semantics></math>