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imc

algebra intermediate

Problem

For each positive integer , the mean of the first terms of a sequence is . What is the term of the sequence?
(A)
(B)
(C)
(D)
Solution
Since the mean of the first terms is , the sum of the first terms is . Thus, the sum of the first terms is and the sum of the first terms is . Hence, the term of the sequence is Note that is the sum of the first n odd integers.
Final answer
B