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We have n identical resistors, call them R1, R2 etc up to Rn. All have resistance R.

Resistance of the whole circuit

= 1/(1/R1 + 1/R2 + ... + 1/Rn)

= 1/(n*(1/R))

= 1/(n/R)

= R/n

So it's the resistance of one resistor, divided by the number of resistors.

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