Question

₁₂C₃

Answer 1

\[\Huge C(12,3)= \frac{12!}{9!3!}= \frac{12 \times 11 \times 10}{3 \times 2}\]

Answer 2

220

Answer 3

right

Answer 4

3! means 3x2x1
4! means 4x3x2x1
formula for C(n,r) = >\[\Huge C(n,r)=\frac{n!}{(n-r)! r!}\]