Sum
Find the indicated terms of the sequences whose nth terms are given by
an = – (n2 – 4); a4 and a11
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Solution
an = – (n2 – 4); a4 and a11
a4 = – (42 – 4)
= – (16 – 4)
= – 12
a11 = – (112 – 4)
= – (121 – 4)
= – 117
a4 = – 12 and a11 = – 117
Concept: Sequence
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