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Please help

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how do I solve these?
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For Q6, you can redraw the circuit into two parts: one part is a set of resistors in series and the other part is 3 resistors in parallel. Grouping the resistors into smaller sets makes the questions much easier to solve. A question I did on isaac physics a while ago had a similar circuit design to Q8, the hint tabs for the isaac question may be helpful. The link is here: https://isaacphysics.org/questions/a_power_problem .

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