6
5
4
3
Correct answer is D
n+1C3=4(nC3)(n+1)!(n+1−3)!3!=4(n!(n−3)!3!)(n+1)n!(n−2)(n−3)!=4(n!n−3!)=n+1n−2=41n+1=4(n−2)n+1=4n−8−3n=−9−9−3n=3
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