A) A.P.
B) G.P.
C) H.P.
D) None of the above
Correct Answer: C
Solution :
Let \[a={}^{n}{{C}_{r-1}},\ b={}^{n}{{C}_{r}},\,C={}^{n}{{c}_{r+1}}\] and\[d={}^{n}{{c}_{r+2}}\]. Substituting these values in problem, we get \[\frac{a+b}{a},\ \frac{b+c}{b},\ \frac{c+d}{c}\] are in H.P.
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