F.4 ..m2 (Binomial Theorem)

1. It is given that (1+kx^3)^n = 1- 8x^3 + 24x^6 +...,Find k and n
,where n is positive integer.

2. If the constant term and the coefficient os x in the expansion of
1 +ax)^4 ( b - x)^5 are 32 and 48 respectively , find a and b.