Which of the fractions given below, when added to $$ \frac{5}{7} $$, gives 1?
Let the fraction be 1/x
According to the question,
(1/x) + (5/7) = 1
1/x = 1 - (5/7)
1/x = 2/7 (or) 6/21 (if '3' is multiplied to numerator and denominator)
Hence, option B is the correct answer.
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