1.

An infinite sequence of resistance is shown in the figure. The resultant resistance between A and B will be, when \[{{R}_{1}}=1\,ohm\] and \[{{R}_{2}}=2\,ohm\]                                 [MP PET 1993]

A.            Infinity                                    
B.            \[1\,\Omega \]
C.                    \[2\,\Omega \]            
D.            \[1.5\,\Omega \]
Answer» D.            \[1.5\,\Omega \]


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