Since 10 ohm, 20 ohm and 50 ohm are in parallel so resistance will be
1/Rp = 1/10 + 1/20 + 1/50
Rp = 100/17
Then 10 ohm is in series
So effective resistance = 100/17 + 10 which will be more than 10 ohm but less than 20 ohm.
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