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?

Options

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

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