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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)

89. When taking pictures in reduced lighting (i.e., low illumination), image noise becomes apparent. One simple way to reduce this granular noise is to take several identical pictures and                  them. (A) XOR (logic operation) (B) average (arithmetic operation) (C) OR (logic operation) (D) AND (logic operation)

90. Which classification (or clustering) method in machine learning field is an unsupervised learning method？ (A) k-means clustering algorithm (B) convolutional neural network (C) Naive Bayes classifier (D) support vector machines

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