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The electron in hydrogen atom in a sample is in \( \mathrm{n}^{\text {th }} \) excited state, then the number of different spectrum lines obtained in its emission spectrum will be :
\( P \)
(A) \( 1+2+3+ \) \( +(n-1) \)
(B) \( 1+2+3+\ldots \ldots \ldots \ldots \ldots . .+(n) \)
(C) \( 1+2+3+\ldots \ldots \ldots+(n+1) \)
(D) \( 1 \times 2 \times 3 \times \)
\( \times(n-1) \)
W.
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