23 Use summation properties and formulas to rewrite and evaluate the sum :02 143'). 3:1 20.2 143') = a: In parts (a)-(d), find the values of the sums in terms of n. In part (e), evaluate the limit of the sum from part (d). n a. K = k=1 n k b. k=1 n2 n C. = k=1 n d. 3k 1 2 = n k=1 n 3k e. lim = n2 n