The sum of the series 2 x 1 x 20c4 - 3 x 2 x 20c5 +4x 3 x 20c6- 5x 4 X20c + ... + 18 x 17 × 20C20,

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5 days ago

The sum of the series 2 x 1 x 20c4 - 3 x 2 x 20c5 +4x 3 x 20c6- 5x 4 X20c + ... + 18 x 17 × 20C20,

The sum of the series 2 x 1 x 20c4 - 3 x 2 x 20c5 +4x 3 x 20c6- 5x 4 X20c + ... + 18 x 17 × 20C20,