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If a : b = c : d then the value of (a^...

If ` a : b = c : d` then the value of ` (a^(2) + b^(2))/( c^(2) + d^(2))`

A

`1//2`

B

`(a+b)/(c+d)`

C

`(a-b)/(c-d)`

D

`(ab)/(cd)`

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The correct Answer is:
D
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