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Question Number 103177 by mohammad17 last updated on 13/Jul/20

Find the gineral form of the sequence ⟨2,−2,2,−2,.....⟩?

$${Find}\:{the}\:{gineral}\:{form}\:{of}\:{the}\:{sequence}\:\langle\mathrm{2},−\mathrm{2},\mathrm{2},−\mathrm{2},.....\rangle? \\ $$

Answered by Dwaipayan Shikari last updated on 13/Jul/20

2Σ_(n=1) ^∞ (−1)^(n+1)

$$\mathrm{2}\underset{{n}=\mathrm{1}} {\overset{\infty} {\sum}}\left(−\mathrm{1}\right)^{{n}+\mathrm{1}} \\ $$

Commented by mohammad17 last updated on 13/Jul/20

thank you sir

$${thank}\:{you}\:{sir} \\ $$

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