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18/20 There are a couple different equivalents: 18/20, 0.9, 27/30
2/18, 3/27, 4/36 and so on.
Some examples of equivalent fractions for 4/9 are 8/18, 12/27, 16/36 Multiplying the numerator and denominator of the fraction by the same integer will give any equivalent fraction you wish.
10 over 18, 15 over 27, etc.
U1 = 27 U{n+1} = U{n} - 3