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Anonymous
77 over 21 = 11/3
77 ÷ 7 = 11
21 ÷ 7 = 3
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2/7
In its simplest form.... 7/11
21/77 in simplest form is 3/11, because both 21 and 77 are divisible by 7.
It is: 77/140 = 11/20
11/77 = 1/7