A) 4
B) 8
C) 6
D) 7
Correct Answer: B $ \Rightarrow $ $ (n-3)(n-4)=20\Rightarrow n=-1,\ 8 $ But $ -1 $ is not acceptable.
Show Answer
Answer:
Solution:
$ \frac{n\ !}{(n-5)\ !}\times \frac{(n-3)\ !}{n\ !} $ =20
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