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## Homework Statement

Can somebody please explain to me what i did wrong here? Got exam tomorrow and it would probably be usefull to know.. Thx

## Homework Equations

axb = a*b/(a+b)

## The Attempt at a Solution

First i tried finding the voltage over 1.5R x R.. Then divide that voltage over R to find the current over R... For some strange reason this is wrong. Plz someone help me to understand why..