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An electron jumps from n^"th" level to t...

An electron jumps from `n^"th"` level to the first level.
The correct statement is :

A

Number of spectral lines `=(n(n-1))/2`

B

Number of spectral lines `=(n(n+1))/2`

C

If n=4, number of spectral lines =6

D

Both (A) and (C )

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