What is the equivalent resistance of a group of resistors?

The resistors are 2 ohm, 1 ohm, and 2 ohm. I know the formula is
Req= 1/R1+1/R2+1/R3
So Req=1/2+1/1+1/2=2
But 2 is not the correct answer? Am I doing something wrong? Please help, thanks!

derfram2015-04-14T20:30:13Z

You've got the formula slightly wrong.

1/Req = 1/R1 + 1/R2 + 1/R3...

You determined that 1/Req = 2 so
Req = 0.5 ohms

10

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