Let `v_(1)` be the frequency of series limit of Lyman series, `v_(2)` the frequency of the first line of Lyman series and `v_(3)` the frequency of series limit of Balmer series. Then which of the following is correct ?
A. `v_(1)-v_(2)=v_(3)`
B. `v_(2)-v_(1)=v_(3)`
C. `v_(3)=(1)/(2)(v_(1)+v_(2))`
D. `v_(1)+v_(2)=v_(3)`