12. Correct. The answer is false
(a) Using the results of Problems 6 and 7 we have
f(v|u) = f(u,v)/f1(u)
f(v|u) = [(2u+v)/42]/f1(u),
so that with u=2
f(v|2) = [(4v)/42]/(11/21)
f(v|2) = (4+v)/22
(b) P(V=1|U=2)= f(1|2)
P(V=1|U=2)= 5/22.