Question 11
Define $C_r^n=\frac{n!}{r!}$, where $n!=n(n-1)\cdots2\cdot1$. Find $C_1^{10}+C_2^{10}+\cdots+C_8^{10}$.
Original printed choices: A: 1012; B: 1020; C: 1010; D: 1008.
Editorial format: answer directly; the printed choices are retained for source fidelity. See the solution for the source issue.
Original printed choices: A: 1012; B: 1020; C: 1010; D: 1008.
Editorial format: answer directly; the printed choices are retained for source fidelity. See the solution for the source issue.