A) \[\frac{1}{2}({{n}_{1}}-{{n}_{2}})\]
B) \[\frac{1}{2}({{n}_{1}}+{{n}_{2}})\]
C) \[{{n}_{1}}\tilde{\ }{{n}_{2}}\]
D) \[2\,({{n}_{1}}-{{n}_{2}})\]
Correct Answer: C
Solution :
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