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Equivalent Resistance: Parallel Circuit

APPH12-YKQXFB

Five identical $20\ \Omega$ resistors are connected in parallel.

What is the equivalent resistance of the group of resistors?

A

$4 \space\Omega$

B

$20 \space\Omega$

C

$25 \space\Omega$

D

$100 \space\Omega$