Find The $n ^ { \text {ct } }$ Term of the Sequence Whose First Several Terms Are

question 98

Multiple Choice

Find the $n ^ { \text {ct } }$ term of the sequence whose first several terms are $\frac { 1 } { 4 } , - \frac { 1 } { 9 } , \frac { 1 } { 16 } , - \frac { 1 } { 25 } , \ldots$

• A) \(Q _ { n } = \frac { ( - 1 ) ^ { n + 1 } } { n ^ { 2 } }\)
• B) \(a _ { n } = \frac { ( - 1 ) ^ { n + 1 } } { ( n + 1 ) ^ { 2 } }\)
• C) \(a _ { \mathrm { n } } = \frac { ( n + 1 ) ^ { n } } { 4 ^ { 2 } }\)
• D) \(a _ { n } = \frac { ( 1 ) ^ { n } } { ( 2 n ) ^ { 2 } }\)
• E) none of these

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