| Can you solve this uber-hard math problem?
Hi, this math problem is from the blue book (official study guide). Prac test 2, sect 2, pg 587
I'd appreciate a solution to this problem/explanation of answer
Q19.
If a,b,c and f are four non-zero numbers, then all of the following proportions are
equivalent EXCEPT:
A) a/f= b/c
B) f/c=b/a
C) c/a=f/b
D) a/c=b/f
E) af/bc=1/1
Correct answer: A--> but why???
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