A) 12
B) 8
C) 6
D) 10
E) 14
Correct Answer: A
Solution :
\[\because \] \[^{43}{{C}_{r-1}}{{+}^{n}}{{C}_{r}}{{=}^{n+1}}{{C}_{r}}\] \[\therefore \] \[r-6+3r+1=43\] \[\Rightarrow \] \[4r=48\] \[\Rightarrow \] \[r=12\]
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