8. What value is returned by the following functions? Express your answer as a function of n Give the worst-case running time of the following functions using the 0,9, notations (a) f(n) (n>0 is an integer number *) T0 for i := 1 to n _ 1 do for j-i +1 to n do for k = 1 to j do r:= r + 1 return(r)