Is there any way to write a binomial coefficient that has brackets in place of parenthesis?

Another way to write what I want would be to get a fraction without the horizontal bar between the denominator and the numerator, and then surround it with big brackets, but is this possible?

## Best Answer

You can tap into

`amsmath`

's`\genfrac`

:`\genfrac{<ldelim>}{<rdelim>}{<width>}{<style>}{<numerator>}{<denominator>}`

sets a fraction braced by`<ldelim>`

and`<rdelim>`

in a fraction-like style with horizontal rule of width`<width>`

. The optional`<style>`

can force the output to be in any of the four math styles.