Relation between the series limits and first-line wavelengths or frequencies of two series

1. A.
   $\lambda_{1}=\lambda_{2}+\lambda_{3}$
2. B.
   $\lambda_{2}=\lambda_{1}+\lambda_{3}$
3. C.
   $\frac{1}{\lambda_{1}}=\frac{1}{\lambda_{2}}-\frac{1}{\lambda_{3}}$
4. D.
   $\frac{1}{\lambda_{1}}-\frac{1}{\lambda_{2}}=\frac{1}{\lambda_{3}}$

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1. A.
   $v_{1} - v_{3} = 2v_{1}$
2. B.
   $v_{1} + v_{2} = v_{3}$
3. C.
   $v_{1} - v_{2} = v_{3}$
4. D.
   $v_{1} + v_{3} = v_{2}$

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