find the effective resistance between P and Q.
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See this can't be done mentally but I am giving you a trick to do this. Just pull both the ends and then look at the position of the resistors. (I am telling you to imagine as if you are pulling the circuit from both the ends). Then look at the postion. Just try it if you get it. Thanks for asking.
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the answer will be 8R/7. hope it will help you
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