(1) and (3) are equivalent.

In (1), AB is expressed in terms of CD, that is: AB = 4CD.

* * * * <----AB

*______<----CD

Consider (3): AB is longer than CD. By how much is it longer than CD?

*|* * *| <---- AB

*_______<---- CD

_<----->_

___3CD___

So, AB is 3CD longer than CD. That is, AB is 3 times longer than CD: AB = CD + 3CD = 4CD.

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