1. First ,L.C.M the denominators of both numbers. 2. We will obtain 21/35 and 20/35 respectively. 3. Then, multiply both number with 4/4(because we have to find three rational numbers). 4. Then ,we obtain 84/140 and 80/140 respectively. 5. Three rational numbers between 3/5 and 4/7 are : 81/140, 82/140, 83/140.

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