An atom has \( x \) energy level, then total number of lines in its...

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An atom has \( x \) energy level, then total number of lines in its spectrum are:-
(1) \( 1+2+3 \ldots . .(x+1) \)
(2) \( 1+2+3 \ldots .\left(\mathrm{x}^{2}\right) \)
(3) \( 1+2+3 \ldots(x-1) \)
(4) \( (x+1)(x+2)(x+4) \)
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