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प्रश्न
Fill in the blank in of the following so as to make the statement true:
x and y are said to vary directly with each other if for some positive number k ....,...... = k.
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उत्तर
\[\text{ x and y are said to vary directly with each other if } \frac{x}{y} = k,\text{ where k is a positive number } \] .
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