MathematicsMedium64×since 2002Q2972The coefficient of x7{x^7}x7 in the expansion of (1−x−x2+x3)6{\left( {1 - x - {x^2} + {x^3}} \right)^6}(1−x−x2+x3)6 isA−132-132−132B−144-144−144C132132132D144144144Check answerSkip