Chemistry!! Please help!

If the wavelength of line B is 142.5 nm, calculate the wavelength of line A.

Line A is the transition of n=6 to n=3
Line B is the transition of n=5 to n=3

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asked by Robin
  1. lambdaA/lambdaB=(1/36-1/9)/(1/25-1/9)

    check my thinking.

  2. i don't get it

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    posted by Robin

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