(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?
\(\phantom{1:8:40}\)
What about 1:2:3? What about 2:4:7? What about 1:8:40?
