Given a (v, b, r, k, )-design based on the v varieties of V, replace each of

Question:

Given a (v, b, r, k, λ)-design based on the v varieties of V, replace each of the blocks Bt, for 1 < I < b, by its complement B1 = V - B1. Then the collection {B1, B2, ... , Bb} provides the blocks for a (v, b, r', k', λ')-design, also based on the set V.
a) Find this corresponding complementary (v, b, r', k', λ -design for the design given in Exercise 1 of Section 17.5.
b) In general, how are the parameters r', k, λ' of the complementary design related to the parameters v, b, r, k, X of the original design?