Question

Equação: An,3 = 3. Cn,4?

Answer 1

An,3 = 3. Cn,4

n(n-1)(n-2) = 3. n(n-1)(n-2)(n-3)/4!

1 = 3. (n-3)/24

1 = (n-3)/8

n-3 = 8

n = 11 ✓