SOLUTION: Which of the following is not a fractional representation for 2/7? a. 4/21 b. 8/28 c. 4/14 d. 6/21

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Question 45291: Which of the following is not a fractional representation for 2/7?
a. 4/21
b. 8/28
c. 4/14
d. 6/21
Answer by mathgenius(8) About Me  (Show Source):
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8/28 Is a fractional representation because 4 times 2 is 8 and 4 times 7 is 28. 4/14 Is a representation because 2 times 2 is 4 and 2 times 7 is 14. 6/21 Is a representation because 3 times 2 is 6 and 3 times 7 is 21. The only one that's NOT a representation is 4/21, because while 2 times 2 is 4, 2 times 7 is 14, NOT 21.