If $a : b :: c : d$ then $b : a :: d : c$ . This property is known as :

Invertendo property

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Alternendo property

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Componendo property

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Dividendo property

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Solution

The correct option is A Invertendo property
If $a : b :: c : d$ then $b : a :: d : c \Rightarrow$ invertendo property.
proof
$\frac{a}{b} = \frac{c}{d}$
inverting both sides, we get
$\Rightarrow \frac{b}{a} = \frac{d}{c}$

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