n(n−1)2
n(n+1)2
(n+1)(n+2)2
n(2n + 1)
Correct answer is C
(n+1)(n+2)2
If n = 1, the expression becomes 3
n = 2, the expression becomes 6
n = 4, the expression becomes 15
n = 5, the expression becomes 21
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