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If a, b, c, d are in proportion, then a ...

If `a, b, c, d `are in proportion, then `a : b = c : d `and written as `a : b : : c : d`.
Which of the following is true?

A

`1:5:: 15:3`

B

`1:3 :: 15:5`

C

`3:5:: 1:15 `

D

`1:5:: 3:15 `

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