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Electronic transition in He^(+) ion take...

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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