1) p+q= odd, means one of p and q is even and other is odd. OR both are odd. lets consider one even and one odd. then it indicates pq is even. p=1, q= 6,p+q-> odd , pq -->even ,f(6)=n(1,2,3,6)=4 p=2, q= 3,p+q->odd, pq -->even ,f(6)=n(1,2,3,6)=4 P could have more than 1 value so st.1 is i...