PLEASE HELP, EASY QUESTION
All of the following proportions are equivalent except
a/b=c/d
b/a=d/c
a/d=c/b
a/c=b/d
![PLEASE HELP EASY QUESTION All of the following proportions are equivalent except abcd badc adcb acbd class=](https://us-static.z-dn.net/files/da2/b1ca9a71820c924a924f38d65f788afe.png)