#### 66.67

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• \( \frac{n(n + 1)}{2} = 210 \)
• \( n(n + 1) = 420 \)
• \( n = \frac{-1 \pm \sqrt{1 + 1680}}{2} = \frac{-1 \pm \sqrt{1681}}{2} = \frac{-1 \pm 41}{2} \)
• #### 1, 3
• \( 35 = \frac{1}{2} \times 10 \times h \)
• \( 35 = 5h \)

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