Electronic transition in `He^(+)` ion takes from `n_(2) " to " n_(1)` shell such that : `2n_(2)+3n_(1)=18` `2n_(2)+3n_(1)=6` What will be the total number of photons emitted when electrons transit to `n_(1)` shell?
A
21
B
15
C
20
D
10
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