(abcd)(abcd)(abcd)(abcd) \displaystyle \tbinom{\displaystyle{a\over b}}{\displaystyle{c\over d}} \textstyle \tbinom{\displaystyle{a\over b}}{\displaystyle{c\over d}} \scriptstyle \tbinom{\displaystyle{a\over b}}{\displaystyle{c\over d}} \scriptscriptstyle \tbinom{\displaystyle{a\over b}}{\displaystyle{c\over d}}