If X walks less fast than Y, and Y walks as fast but not faster than Z; then, as compared to X, Z walks:

If X walks less fast than Y, and Y walks as fast but not faster than Z; then, as compared to X, Z walks:

If x, y, z are positive integers, such that xy + x + y = 215, yz + y + z = 161 and zx + z + x = 107, then (y – z)/(x – z) =

If y/(x - z) = (y + x)/z = x/y then find x : y : z ?1 : 2 : 33 : 2 : 14 : 2 : 32 : 4 : 7

If X~ N(0, 1), Y~N(0, 4), Z~N(0, 25). X, Y, Z are pairwise independent. Then X+Y+Z ~ N(0, 64)X+Y+Z ~ N(0, 29)X+Y+Z ~N(0, 30)X+Y+Z~ N(0,50)

Let Z be the set of all integers andA = {(x, y); x4 – y4 = 175, x, y ∈ Z}B = {(x, y); x > y, x, y ∈ Z}Then, the number of elements in A ∩ B is