There are a huge number of them.
One of them is 2/7 .
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6/21 = 2/7
It is: 6/21 = 2/7 in its simplest form
equivalent fractions of 3/21 = 6/42, 9/63, 12/84,...
2 over 7 and 12 over 42
Yes, 2/7 and 6/21 are equivalent. 2/7 * 3/3 = 6/21. Since 3/3 is the same as 1, we know the fractions are equivalent.