1) (4 choose 2)*(13 choose 0)*(13 choose 5)*(14 choose 4)/(52 choose
13)

2) 18

3) 3/7 and 0.36

4) 15/4 and root(95)/4

5) 0.15

6) 0.795

7) 0.8 and 0.43

8) 0.01

9) 0.46

10) 250/3 and 1/3

11) 1/3 and infinity

12) 1/3  -  root(3)/(4*pi)

13) 1/(2 root(y)) for y in (0,1). 0 for all other y.

14) - log_e(w) for w in (0,1). 0 for all other w.

15) 16/9

16) F_X(x) = 1- exp(-x) for x>0
    F_Y(y) = 1-exp(-y), for y>0
    f_X(x) = exp(-x), x>0
    f_Y(y) = exp(-y), y>0,
    independent