Algebra Ch 48: Sequences and Series (16 of 34) Write Series Using the Sigma Notation - Challenging

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Given: 1-x^2+x^4-x^6+x^8-x^10
Find: SIGMA NOTATION=? Challenging Problem

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[souhilaoughlis]

Can we write it like
Σ from n=1 to 6 of ((-1)^(n-1). (x²)^(n-1)