39. Which vectors form the basis of null( A )?
(A) [-3,2,1, -1,1]
(B) [-1,-2,1,0, 0]
(C) [1,-3,0, -4,1]
(D) [2,-1,0, 1, -1]
(E) None
1.(5%) Consider
x1+x2+⋯+xn=r,
where a≤xi≤sb for I ≤i≤n. What is the generating function for the
eger solutions to the above equation (where the desired count appe
coefficient of x', where r=0,1,...)?