Sum of first n natural numbers — task. Maths CBSE Live product, Class 9 (2026-27).

Calculate the sum \(1\tfrac{1}{5} + 2\tfrac{1}{5} + 3\tfrac{1}{5} + \cdots +80 \tfrac{1}{5}\)

The sum of the given series is

Answer variants:

3246

3276

3236

3266

3256

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3. Sum of first n natural numbers