A) \[\frac{ac+ab+bc}{{{b}^{2}}+ac}\]
B) \[\frac{2ac+ab+bc}{{{b}^{2}}-ac}\]
C) \[\frac{ab+ac}{{{b}^{2}}-ac}\]
D) None of these
Correct Answer: B
Solution :
Trick: Here\[a={{\,}^{n}}{{C}_{r}},\,\,b={{\,}^{n}}{{C}_{r+1}}\]and \[c={{\,}^{n}}{{C}_{r+2}}\] Put\[n=2,r=0\], then option (b) holds the condition i.e. \[n=\frac{2ac+ab+bc}{{{b}^{2}}-ac}\]
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