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From the diagram we have this information :
2.4 Ω and 2.4 Ω are in parallel .
1/R = 1/2.4 + 1/2.4
⇒ 1/R = 2 × 1/2.4
⇒ 1/R = 1/1.2
⇒ R = 1.2
4 Ω and 1 Ω are in parallel .
1/R = 1/4 + 1/1
⇒ 1/R = ( 1 + 4 )/4
⇒ 1/R = 5/4
⇒ R = 4/5
⇒ R = 0.8
0.8 Ω and 1.2 Ω are in series.
R = 0.8 Ω + 1.2 Ω
= R = 2Ω
ANSWER:
OPTION A
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