Consider the sum sequence (an)n>0 = 4, 11, 18, 25, 32, … (a) What type of sequence is (an)nzo? Find an explicit formula an. (b) Is 249 in the sequence? Explain. (c) How many summands are in the sum 4 + 11 + 18+ 25 + (d) Compute the sum using Gauss' trick. • +249?

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