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If a: b= 5:7 and c:d=2a:3b, then ac: bd ...

If a: b= 5:7 and c:d=2a:3b, then ac: bd is :

A

`20:38`

B

` 50 : 147`

C

`10 : 21`

D

`50 : 151`

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The correct Answer is:
C
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