3630
3360
1120
560
Correct answer is D
n+1(n−2)(n+1)!
(n+1)+(n−2)!(n−2)!(n+1)!
(n+1)(n+1−1)(n+1−2)(n+1−3)!3!(n−2)!
(n+1)(n)(n−1)(n−2)!3!(n−2)!
(n+1)(n)(n−1)3!
Since n = 15
(15+1)(15)(15−1)3!
16×15×143×2×1
= 560
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