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In a sample of hydrogen atoms, electrons...

In a sample of hydrogen atoms, electrons jump from `10^(th)` excited state to ground state. If X are the number of different ultraviolet radiations Y are the number of different visible radiations and Z are the possible number of different infrared radiations from `10^(th)` excited state to third level. The value Z-(x + y) is (Assuming all the Balmer lines lie with in visible region)

A

17

B

18

C

19

D

36

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