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प्रश्न
If a/b = c/d prove that each of the given ratio is equal to `(13a - 8c)/(13b - 8d)`
उत्तर
Let `a/b = c/d = k`
Then a = bk and c = dk
`(13a - 8c)/(13b - 8d) = (13(bk) - 8(dk))/(13b - 8d) = (k(13b - 8d))/(13b - 8d)` = k = each given ratio
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