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Question
In which of the following table x and y vary inversely:
| x | 5 | 20 | 10 | 4 |
| y | 20 | 5 | 10 | 25 |
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Solution
\[ \text{ In all cases, the product xy is constant for any two pairs of values for x and y } . \]
\[\text{ Here, xy = 100 for all cases } \]
\[\text{ Thus, in this case, x and y vary inversely .} \]
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