88. Let f(n)= f(n-1)+(n-1) , where n ≥ 2 , and let f(1) =0 . Then (A)f(n)=n2-2n+1 (B)f(n)=n2-n (C) (D)
F(2) = F(1) + 2 - 1 = 1
F(3) = F(2) + 3 - 1 = 3
F(4) = F(3) + 4 - 1 = 6
以 值帶入符合( n^2 - n ) /2
88. Let f(n)= f(n-1)+(n-1) , where n ≥ 2..-阿摩線上測驗
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