Discussion about math, puzzles, games and fun. Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ π -¹ ² ³ °

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I understand! Thank you so much!

I missed this class on how you do this. What process did you go through to get these numbers?

**Nikster**- Replies: 5

Find the first five terms of an arithmetic series with S10 = 210 and S20 = 820

S= Sum

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