The sum of the series 2 \times 1 \times{ }^{20} C_4-3 \times 2 \times{ }^{20} C_5+4 \times 3 \times{ }^{20} C_6-5 \times 4 \times { }^{20} {\C}_7+. . . . .+18 \times 17 \times{ }^{20} {\C}_{20}, is equal to \_\_\_\_ . [7 Apr 2025 Shift 2]

Binomial Theorem Part 3

Section: Mathematics

Question : 12 of 45

Marks: +1, -0

The sum of the series 2×1×‌20C4−3×2×‌20C5+4×3×‌20C6−5×4× ‌20C7+.....+18×17×‌20C20, is equal to ____ .

[7 Apr 2025 Shift 2]

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