5 ∑ n=2 (n+1) = help!!!

jawab

5
Σ  (n+1)  =
n=2

n = 2 → (2+1) = 3
n = 3 → (3+1) = 4
n = 4 → (4+1) = 5
n = 5 → (5+1) = 6
jumlahkansemua = 18