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1)
2/7 + 5/21 + 2/6
LCM of 7,6,21 = 42
2/7 x 6/6 = 12/42
5/21 x 2/2 = 10/42
2/6 x 7/7 = 14/42
12/42 + 10/42 + 14/42 = 36/42
36/42 divided by 6 = 6/7
So, the answer is 6/7
2)
5/21 + 10/21 = 15/21
15/21 divided by 3 = 5/7
So, the answer is 5/7
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