A) 3
B) 4
C) 5
D) 6
Correct Answer: C
Show Answer
Answer:
Solution:
Þ $ \frac{(n+1)!}{3!.(n-2)!}=2.\frac{n!}{2!.(n-2)!} $
Þ $ \frac{n+1}{3.2!}=\frac{2}{2!} $
Þ $ n+1=6\Rightarrow n=5 $ .
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