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Assunta Fisher

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3y ago
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8y ago

sum of n terms of an AP with first term a and common difference d is given by:

Σ = ½n(2a + (n-1)d)

→ sum = ½ × 10 × (2 × -10 + (10 - 1) × -2) = −190

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Q: What are the first ten terms of a sequence whose first term is -10 and whose common difference is -2.?
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