(abcd)(abcd)(abcd)(abcd) \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}}