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n=1
E= -13.6ev
change in energy =-13.6+12.75= - 0.85
En=. 0.85
-0.85= -13.6*1^2/n2
by simplifying we get n=4
or
E4=-13.6*1/4²= -13.6/16 = -0.85
Thus n=4
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