A) 12
B) 8
C) 6
D) 10
Correct Answer: A
Solution :
Given, \[^{43}{{C}_{r-6}}\,={{\,}^{43}}{{C}_{3r+1}}\] Þ \[r-6=3r+1\] or \[r-6+3r+1=43\] Þ \[r=-\frac{7}{2}\] (impossible) or \[r=12\].
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