The voltage across 6Ω resistor is __________

(a) 7.5V

(b) 6.78V

(c) 20V

(d) 8.5V

I got this question in a national level competition.

This interesting question is from Thevenin and Norton Equivalents,More on Deriving a Thevenin Equivalent topic in section Techniques of Circuit Analysis of Electric Circuits

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