A) \[\frac{(n-1)\,\,d}{{{a}_{1}}+{{a}_{2}}}\]
B) \[\frac{(n-1)\,\,d}{1+{{a}_{1}}{{a}_{n}}}\]
C) \[\frac{nd}{1+{{a}_{1}}{{a}_{n}}}\]
D) \[\frac{{{a}_{n}}-{{a}_{1}}}{{{a}_{n}}+{{a}_{1}}}\]
E) None of these
Correct Answer: B
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