We can create a combinations symbol by removing the division line in the fraction element.
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<title>XoaX.net's MathML: Combinations Example</title>
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<p>
The number of combinations of n things taken p at a time is
<math>
<mmultiscripts>
<mi>C</mi>
<mi>p</mi>
<mrow></mrow>
<mprescripts />
<mi>n</mi>
<mrow></mrow>
</mmultiscripts>
<mo>=</mo>
<mrow><mo>(</mo>
<mfrac linethickness="0">
<mi>n</mi>
<mi>p</mi>
</mfrac>
<mo>)</mo></mrow>
</math>
</p>
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