(a) The 6th term of an A.P is 35 and the 13th term is 77. Find the 20th term.

(b)  

The Venn diagram represents three subsets P, Q and R of the universal set U. Copy the Venn diagram. Shade and indicate the regions represented by (i) \(P \cap Q' \cap R\) ; (ii) \(P' \cap Q \cap R'\).