In the expansion of (1-x) 5 + (1-x) 6 + (1-x) 7 + (1-x) 8, the coefficient of the term with X3 is () A. 74B. 121C. -74D. -121

In the expansion of (1-x) 5 + (1-x) 6 + (1-x) 7 + (1-x) 8, the coefficient of the term with X3 is () A. 74B. 121C. -74D. -121

In the expansion of (1-x) 5 + (1-x) 6 + (1-x) 7 + (1-x) 8, the coefficient C35 (− 1) 3 + C36 (− 1) 3 + C37 (− 1) 3 + C38 (− 1) 3 = - 10 + (- 20) + (- 35) + (- 56) = - 121, so D is selected