Question 417637
In order to add fractions, the denominators must all be the same. So let's get all the denominators equal to the LCD 21. 



2/7+4/21+1/3 = (2/7)*(3/3)+4/21+(1/3)*(7/7) = 6/21+4/21+7/21 = (6+4+7)/21 = 17/21



So 2/7+4/21+1/3 = 17/21



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