Question

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Answer 1

Series : r .  There are 3 resistors i.e   r1 + r2 + r3 = 2 + 2 + 2 = 6 ohm
Parallel : 1/r. There are 4 resistors i.e ..
1/r = 1/6 + 1/6 + 1/6 + 1/6
    r   = 3/2
        = 1.5ohm

Answer 2

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