Which one of the following is the resistance that must be placed parallel with 12Q resistance to obtain a combined resistance of 4Q ?

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Q: 74 (NDA-II/2009)

Which one of the following is the resistance that must be placed parallel with 12Q resistance to obtain a combined resistance of 4Q ?
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question_subject: 

Science

question_exam: 

NDA-II

stats: 

0,3,6,3,3,3,0

keywords: 

{'combined resistance': [0, 0, 2, 0], 'resistance': [0, 0, 1, 2], '4q': [0, 0, 1, 0], '6q': [0, 0, 1, 0], '8q': [0, 0, 1, 0]}