Number of spectral lines in balmer series when an electron

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Number of spectral lines in balmer series when an electron return from 7 th orbit to 1st orbit of hydrogen atom are.......( Plzzzzz show calculation)

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(7-1)(7-1+1) /2
(6)(7) /2
42/2
21 this is total no of spectral line

spectral line for balmer series = (7-2) =5

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