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9/10 * 2/3 = 3/5

3/16 * 4/9 = 1/4 * 1/3 = 1/12

3/5 * 5/12 = 3/12 = 1/4

3/4 * 8/15 = 3/1 * 2/15 = 2/5

4/5 * 3/8 = 1/5 * 3/2 = 3/10

5/7 * 14/25 = 2/5