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Vincen
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The sequence \(a_1, a_2, a_3, \ldots, a_n,\ldots\) is such that \(a_n= \dfrac1{n^2}-\dfrac1{(n-1)^2}\) for all integers \(n\ge 2\) and \(a_1 = 1.\) Which of the following could be the sum of sequence if the number of terms in the sequence is a prime number?
A. \(\dfrac1{13}\)
B. \(\dfrac1{31}\)
C. \(\dfrac1{225}\)
D. \(\dfrac1{289}\)
E. \(\dfrac1{324}\)
Answer: D
Source: e-GMAT
A. \(\dfrac1{13}\)
B. \(\dfrac1{31}\)
C. \(\dfrac1{225}\)
D. \(\dfrac1{289}\)
E. \(\dfrac1{324}\)
Answer: D
Source: e-GMAT
