Question

Determine n if ²nC3: nC3 = 12:1​

Answer 1

Answer:

» 2nC3 : nC3 = 12 : 1

» [2n (2n - 1) (2n - 2)]/[1 × 2 × 3] ×

[1 × 2 × 3]/[(n (n - 1) (n - 2)] = 12

» 4 (2n - 1)/(n - 2) = 12

» 2n - 1 = 3n - 6

» n = 5