(a) Simplify (n/k)/(n/(k - 1))
(b) For some positive integer n, the expansion of (1 + x)^n has three consecutive coefficients a, b, c that satisfy 1:8:28. What must n be?
(n/k) / (n / (k - 1)) ==(n/k) x (k - 1) / n ==(k - 1) / k
b) See the answer here: https://web2.0calc.com/questions/counting-solutions