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[" The coctriciont of "xy^(3)" in the Ex...

[" The coctriciont of "xy^(3)" in the Expansion of "(1-x+y)^(20)" i "],[[" (1) "(20!)/(213!)," (2) "-(20!)/(2!3!)," (3) "(20!)/(5!2!3!)," (4) "(20!)/(15!2!3!)]]

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