P4.1 Text Problem 5.7 (Page 228). Answers: (a) d = (n-1)(n-2)abc"-2, n 23, (b) fy(y) = (n -2) ben-2 b (by + c)n-1 , (c) a+b5.7 For positive constants a. b . c . and positive integer n, a pair of random variables has a joint PDF specified by fx, p(x, y) d u(x)( y) . (ax+ by+c)" (a) Find the constant d in terms of a, b. c. and n. (b) Find the marginal PDFs. f(x) and f (y) . (c) Find Pr(X> n)