Let R be the space of all the N! permutations of (1,2,...N), and let R = (R1, ...Rn) be uniformly distributed over R. Prove that (i) P(Ri=k) = 1/N; 1<=i, k<=N. (ii)P(Ri=k, Rj=h) = 1/N(N-1), 1<= i ≠j, k≠h<=N (iii)P(Ri=k, Rj=k) = 0, 1<=i≠j, k<=N.

What is the inverse of the function f(x) = 2x + 1?

How do i start to solve? would appreciate a walk-thru! a bird sitting 16ft above the ground in an apple tree dislodges an apple. after how many seconds does the apple land on the ground? (assuming that no branches will interfere with it's fall)

What is the length of the midsegment of a trapezoid with bases of length 15 and 25 ?