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An electron jumps from n^(th) level to 1...

An electron jumps from `n^(th) `level to `1^(st)` level, the fact ( s) which is `//` are correct of H - atoms is `//` are

A

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

B

number of spectral lines `= Sigma ( n - 1)`

C

If n = 4, the number of spectral lines = 6

D

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

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The correct Answer is:
A,B,C
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