Answer:
21/99 or 7/33
Explanation:
let 'x' = .21 repeating
100x = 21.21 repeating
subtract 1x from 100x to get:
21.21 - 0.21 = 21
100x - 1x = 99x
99x = 21
x = 21/99 or 7/33 simplified
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