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Mathematics, 14.05.2021 07:20 gingerham1

PLEASE HELP Which expression defines the arithmetic series 1 + 5 + 9 + ... for seven terms?
Σ(27-1)
Σ(3n-4)
Σ(4n-3)
Σ(n-1)

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Which expression defines the arithmetic series 1 + 5 + 9 + ... for seven terms?
Σ(27-

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