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Anonymous
It isn't, it can be reduced to 1/3.
Wiki User
The simplest form of 15 over 36 = 5/12
21/36 in simplest form is 7/12
divide top and bottom by 3....7/12
It is 12 over 13.
33/36 = 11/12
1/12
11/12
7/12
1/3
12/23
12/65