The diagrams show two ways in which three lamps X, Y and Z may be connected.
Which statement is correct?
If lamp Y breaks in circuit 1, both the other lamps go off.
2 )
If lamp Y breaks in circuit 2, both the other lamps go off.
3 )
If lamp Y breaks in circuit 1, lamp Z goes off, but lamp X remains on.
4 )
If lamp Y breaks in circuit 2, lamp Z goes off, but lamp X remains on.
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