TMUA 2016 Paper 1 Q4 — Worked Solution

P1·Sequences & Series·5.0Official · 2016 · Q4

alternating-signsseries-simplificationsummation

The sequence

a_{n}

is defined by the rule:

a_{n} = (- 1)^{n} - (- 1)^{n - 1} + (- 1)^{n + 2}

for

n \geq 1

. Find the value of

\sum_{n = 1}^{39} a_{n}

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