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Question

Hi appreciate your assistance on this question.  Answer is 3. Why 3 since P n Q are not connected. Thought answer shld be 4. 

Answer

Both (3) and (4) satisfy the conditions for lighting up when the tester is connected to P & Q, and Q & S.

P & Q are connected in (3) through T. There is still a close circuit.

 

However, answer is not (4) because U is also connected, thus the second test case P & U should also light up.

Correct answer is (3).

 

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Hi i understand now. Thks!

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You are welcome!

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