# The equation corresponding to the wave number of spectral line in the Bracket series

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The equation corresponding to the wave number of spectral line in the Bracket series
A. R[(1//2^(2))-(1//4)^(2)]
B. R[(1//4^(2))-(1//5^(2))]
C. R[(1//3^(2))-(1//5^(2))]
D. R[(1//6^(2))-(1//4^(2))]

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For bracket series n_(1) = 4, n_(2) = 5,6,7..