Question

If there are ‘M’ switches in series numbered from 1, 2, …, M. For circuit to be complete and bulb to glow which of the following is necessary?

(a) 1∧ 2∧ 3 ∧ … ∧M should be on

(b) 1∧ 2∧ 3 ∧ … ∧M should be off

(c) 1 v 2 v 3 v … v M should be on

(d) None of the mentioned

This question was addressed to me in exam.

This key question is from Logic Circuits topic in chapter The Foundation: Logics and Proofs of Discrete Mathematics

Answer 1

Right choice is (a) 1∧ 2∧ 3 ∧ … ∧M should be on

For explanation: All should be on in-order to complete the circuit.