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a) 2 Resistors in parallel gives an equivalent resistance of 5 ohms. Then this connected with three more resistors in series gives an equivalent resistance of 10+10+10+5 = 35 Ohms
b) 10 resistors connected in parallel gives an equivalent resistance of 1 Ohm
c)Three resistors connected in parallel gives an equivalent resistance of 10/3 = 3.3 Ohms
d)2 Resistors in parallel gives an equivalent resistance of 5 Ohms and this connected in series with 4 resistors which are conneted in parallel gives an equivalent resistance of 5 + 2.5 = 7.5 Ohms