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