0
Anonymous
1/21
Wiki User
The simplest form of 21 over 42 is 21/42 = 1/2
28 over 42 in simplest form is 2/3
42/189 in simplest form is 2/9
42/63 = 2/3
42/189= 2/9
the answer is 2/5
2/5
2/3
It is: 2/7
7/2