Energy of level 1,2,3 of a certain atom ...

Energy of level 1,2,3 of a certain atom corresponds to increasing value of energy `E_1ltE_2ltE_3` If `lamda_1 , lamda_2` and `lamda_3` are the wavelength of radiation corresponding to transition `3rarr2 , 2rarr1` and `3rarr1` respectively . Which of following statements is /are correct?

`1/lambda_3=1/lambda_1+1/lambda_2`

`lambda_3=lambda_1lambda_2//(lambda_1+lambda_3)`

`1/lambda_2=1/lambda_1+1/lambda_3`

`lambda_2=lambda_1lambda_3//(lambda_1+lambda_3)`

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