What is the effective resistance across A and B?

Answer by John Thimakis:

Looks confusing because of the way it is drawn.
All three resistors are actually parallel.
So Rt= 1 / ( (1/R1) + (1/R2) + (1/R3) )  —-> 1 / ( (1/1) + (1/2) + (1/3) )
1 / ( 1 + 0.5 + .33333 ) ——>   1 / ( 1.83333 )   =  0.545 Ohms (approx)

What is the effective resistance across A and B?

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