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Find the effective resistance of the circuits shown below.
Assume that R₁=R₂= 1 kOhm.

	Reff = 1 kOhm + 1 kOhm	(Reff)-1 = (1 kOhm)-1 + (1 kOhm)-1
	Reff = 2 kOhm	Reff = 500 Ohms

Using only 1 kOhm resistors, make a circuit with R_eff = 2/3 kOhm.