10/21 is in its simplest form.
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10/21 is in its simplest form.
42/20 = 21/10 = 21/10
Since the numbers 20 and 21 share no common positive integer factors, 20/21 is expressed in its simplest form.
12/21 = 4/7 in its simplest form.
No, the simplest form is 8/21