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The ten switches A,B,C,D,E,F,G,H,N,M are placed in the given circuit (all are open at given time). If you close one switch you need to pay 1 unit cost. What is the cost you need to pay to glow this Lamp?

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The ten switches A,B,C,D,E,F,G,H,N,M are placed in the given circuit (all are open at given time). If you close one switch you need to pay 1 unit cost. What is the cost you need to pay to glow this Lamp?

(a) 1 unit

(b) 2 units

(c) 3 units

(d) 4 units

The question was asked in a job interview.

Enquiry is from Logic Circuits topic in division The Foundation: Logics and Proofs of Discrete Mathematics

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Correct choice is (a) 1 unit

The best explanation: This can be achieved by turning one of switches N or M on.

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